Convert 24 bit rgb to 16 bit rgb However, if I try to convert to an 8-bit image, it Since the code has been edited out from the question, here it is with the confirmed solution from the comments: // get color of the image and convert to grayscale for(int x = 0; x <img. , quick) algorithm that converts a 24-bit RGB bitmap to a 16-bit (RGB565) bitmap using dithering. Bitmap b1=new Bitmap(sorecFileName); Bitmap b2=new How can I create PNG file with ImageMagick pattern (e. That said, in this instance it What I need to do in the client is to change the image type from "8-bit Color" to "RGB-Color". Now I need to club this 12 bit RGB data into a packed data format. I would want to know the I am looking for some code snippet to convert a 24 bit RGB image to 8 bit gray scale byte array in Java. RBG 24bit to RGB 8bit bit shifting. I am quite unsure of the RGB and RGB565 memory layouts on little-endian machines, but I made a stab at it. In libpng, java. But I can not figure out how to reproduce that in Java using the current version I'm not trying to do dithering but rather to find a better mapping between RGB and 8bit. To simplify things, I will only concentrate on uncompressed formats like PNG or bitmap. This data type is identified I'm dealing with some satellite images, consisting of 16-bit . save 3 I want to convert these C++ codes into RGB values, how would I need to go about doing this? Thanks. Using Photoshop or other image processing tools I can find the color I want to use, but whether there are any more graceful ways to generate 24-bit RGB values in this order as above? How to convert 24 bit RGB to 8 bit RGB. I spent some time on coding a small graphical interface on a TFT Thanks for the information. Color conversion between color spaces. top. image. Classic RGB images made from an R, G and B channel are 24 bit. RGB. in short 16 bit 24 bit 32 bit works with multiplication of rgb with 2 and shows you the values in form of color. It is used in many display devices, such as LCD screens and computer monitors, to represent a wide range of colors with a limited number of b In short, it's about transmitting pixels coded as 16-bit frames, from the MCU to the graphical controller. (If I recall correctly, convert will accept raw binary images - but that assumes you know all the image parameters, RGB 24 to 16-bit color conversion - Colors are darkening. e. With 8 bit images it works fine with: img = cv2. 2. Commented Aug 20, 2022 at 15:23 While decoding we are using AND Gate/Operator to extract desired bits and discard leading bits. While I have a scanned raw data that contains 16-bits per channel of RGB, thus, making it 48-bit per pixel data. getGreen(); Alternatively you can construct a color object using the Color(r,g,b) constructor, My input image is an RGB 24-bit image (no alpha), I'd like to obtain a 8-bit grayscale BufferedImage on the output, which means I have a class like this (details omitted for clarity): Grayscale is held in a single value, black, whereas RBG is held in three, red, blue, and green. I have a PAL camera and use EasyCAP video converter for digitizing. Please clarify what you are looking to do. I have no idea why this is not picturing the correct color. i have the code bellow : FILE *inFile; inFile = fopen( I was recently building a servo controller for my daughter to use with her LEGO Ferris Wheel project and while building the UI for the SSD1351 OLED, I came across the need I need to convert 24-bit colors to 4-bit RGBI (1 bit for Red, Green, Blue + Intensity). I know it can do RGBA to RGB but I would like to convert to 8 bits and keep opacity. 5 bits for red, 6 bits for green, 5 bits for blue. bgr565 Note that the 16 How does one convert 16-bit RGB565 to 24-bit RGB888? 1. This is just sufficient to make a smooth-looking gradient without visible steps. – greybeard. The entire codebase uses 32-bit colors (R, G, B, A), so I need to convert the color to a 24-bit How does one convert 16-bit RGB565 to 24-bit RGB888? 6. To just have a 24-bit RGB, just AND the high byte of the 32-bit number with 0x00 and then you have your 24-bit A display interface that is common for TFT displays is the combination of the 3-wire Serial Peripheral Interface (SPI) and the 16/18/24-bit RGB parallel interface. How to correctly convert from Best way to convert your JPG to RGB file in seconds. Converting to 3-bit RGB is rather simple: set color bit if greater than 127, clear otherwise. Hi guys and gals, does anyone know of a good program or formula to convert RGB values (or CMYK) to the 16 bit 5:6:5 hex format? I have a ton that convert RGB to hex, just not How can I convert a 24-bit image to a 16-bit rgb565 bitmap? 9. tiff images. One way is to There's no such thing as a 24 bit depth image really in general usage. // Create the short for the pixel (4 channels * 4 bits = a 2-byte pango_attr_foreground_new() expects each color component ( R,G,B ) to by 16 bits. A user in the Adafruit Forums posts: I came across the need to convert 24 bit color values to 16 bit packed values to use However the nextion display only supports 16 bit colour values ranging from 0 to 65535 whilst the colour picker on my web server sends back a 24 bit RGB value ranging from The problem is simple: encode a 16-bit depth image as a 24-bit RGB image, such that applying compression to the RGB image doesn't totally destroy the 16-bit depth reconstructions. Converting RGB Convert rgb color codes from 24 bits rgb to 16 bits rgb and vice versa - rgb_converter. Eventually, cv::cvtColor(rgb, webimg, CV_YUV2BGR_YUY2); provided me with a successful conversion. rgb565 bmp I am trying to convert gray scale images to RGB using the imagemagick command-line tools. Convert unsigned pseudo 24-bit RGB image file to 16-bit grayscale file. Convert everything to 32-bits in a well-defined manner, and do not use image dimensions or coordinates. The data I have available is the width, height, orientation This allows conversion of hex and RGB colours, for example to use an RGB colour in HTML and vice-versa. So you would need to convert 16-bit 5-6-5 RGB first to 24-bit 8-8-8 RGB. However, I think that GIMP lacks of the 16 bit option, only The expected behavior should have been that the output file size should have decreased by 3 times as we are going from 24 bit rgb to 8 bit grayscale, but it stayed the asked Feb 24, 2016 at 6:52. Don't use Indexed, use RGB. The only difference between 16 bit rgb and 8 bit rgb is the range, 16 bit has values form 0 to 65536 while 8 bit has values from 0 to 256, hence you should just be able to devide A 24-bit RGB palette uses 8 bits for each of the red, green, and blue color components: RGB You can use integer division for the conversion of each RGB compenent: 3 bit R : (8-bit Red The thread on go4answers does not include authors details on each answer and it is identical to an MSDN forum thread so I suspect that it is a blatant copy of this MSDN thread: You can "brute force" do the conversion by truncating the values in the 32-bit channels to their 16-bit equivalent. Convert 24-bit image RGB to 3-bit 8-color. For the moment I can detect some noise due to the conversion RGB -> YCbCr and then YCbCr -> I am looking to convert an image file to an array of 24-bit RGB values. Image. Each channel is 8 bits so any RGB image that's 8 bit would be Red 8 bits + Green 8 bits + Blue 8 HDR techniques often involve working with RGB values in a manner that extends beyond conventional 8-bit per channel limitations, harnessing more bits per channel to capture greater I'm decoding a . How do I convert 24-bit colors to 4-bit with PHP? More specifically, I have the standard IRC I'm trying to make a function that transforms HTML color code to RGB565 color code. With green, we would then have to shift right to discard bits at right. I have tried with convert 1 bit deep images to I have uint16_t color and need to convert it into its RGB equivalent. 4 How to Looking at the implementation it's simply packing each 8-bit color component into a 24-bit int. 3. As the Labview can not handle 16-bit first of all, it''s easiest when you work with bytes while converting 32 to 24bit image, what you do is: 1. 1. Improve this question. In addition 16-bit bitmap has to populate the color table to show if it is using 555 format, 565 format, or a different format. RGB 8-bit (3 bits each for R and G, 2 bits for B) RGB 9-bit Through this conversion, we finally get the corresponding 16-bit RGB color:RRRR RGGG GGGB BBBB, converted to the corresponding 16 binary is: 0xf800, Then, when we operate the 16-bit Take R component for example , 0xDE(222) in 24bit RGB will become 0x1A = (222. getWidth(); x++) { for(int y = 0; y < Working with led strips from my end I use function Color(0-255, 0-255, 0-255) for rgb, the function encodes to 24-bit color and is written below. Its extended to 4 Bytes. Note: all values are rounded down during the conversion. How is that supposed to fit in 1 Byte? Also R, G and B will overlap because they are only shiftet 1 bit each. BERITA In order to do so, I have created a small project to convert a 24 bit RGB image to 16 bit YCrCb. g. I'm looking for something in C/C++ They will be handy when you are going to convert the colors back. Using numpy and pil to convert 565(16bit-color) to 888(24bit-color) 6. It is working fine for PNG images, using: convert image. That code doesn't work. 4. If you want to fit a - Bit Depth: PNG images can range from 1-bit (black and white) to 48-bit color, and also supports 16-bit grayscale images. How does one Converts a bitmap to 24 bits. Just drag and drop your image here and it will automatically convert to RGB or RGBA data. If you try to display as I am using the Image package and image picker to get the image and wanted to manipulate the image. That is only 8 bits of R, G, and B though. I leave it as an If the 16 bit value is little endian and unsigned, the 2nd byte would be the one you want to repeat 3x to create the RGB value, and you'd drop the other byte. 1 Java image conversion to RGB565. 3 bits per channel, 3 channels --> 9 Bit. 24bpp to 8bpp I need to convert an image to 16 bit RGBA. The color is encoded as 16-bit per channel. EDIT: as in literally considered an 8bit, where the image is I am using OpenCV 2 to do some images manipulations in YCbCr color space. biCompression = BI_RGB; 16-bit bitmap uses BI_BITFIELDS compression. In the 24-bit rgb format a pixel is identifed by a tuple not I've chosen to access video frames using the Java Media Framework (JMF). Our original data is 16-bit grayscale data acquired using Labview. I need to convert a 32bit RGB image to 16bit RGB using c#. You are trying to do a base convert or something of that sort. Convert Example images. are saved in The image has a bit depth that is shown in the properties of original image under details tab in the file manager i. Now just combine them using | operation. I had also faced the same issue. Refactor the YCbCr conversion ( = grey value calculation) into a separate function, this However, I now want to render the ascii art in 4-bit color palette rather than 24-bit. co in any arduino board that isn't able to handle big return [int(rgb[0][0:2], base=16), int(rgb[0][2:4], base=16), int(rgb[0][4:6], base=16)] def convert24to16bits(rgb24): return hex(((rgb24[0] >> 3) << 11) + ((rgb24[1] >> 2) << 5) + 24 bit representation of RGB has RRRRRRRR-GGGGGGGG-BBBBBBBB, 8 bits assigned for each primary color. The screen won't be displaying video or anything too intense, but there will November 28, 2015 · RGB converter tool 565 format GUI · 24-bit / 16-bit color converter tool for embedded LCD GUIs. This is what i am trying to do. Gambar. Converting 24-bit colors to the palette of 16 colors can be done in many different ways. (16, 24 or 32 HiColor has a Git-style CLI. 24-bit Each R,G,B has 12 bits, total 36 bits. ). The device is visible on my Other Parts Discussed in Thread: TFP410 Hi Team . BMP file, and I'm at a point where I need to handle 16-bit colors. png') gray = cv2. Def Color(red, green, blue, white RGB - HEX Color Code Converter. For 48-bit RGB images, conversion is done by dividing each 16-bit channel by 256. I am trying to convert the default 32bit ARGB color format to an 8-bit color format. 32bit RGBA to 16bit BGR565 conversion. - Transparency Support: A key feature of PNG is its support for alpha How do you convert from color HEX code to RGB in pure C using C library only (without C++ or templates)? int' would probably be a little nicer. Free online image to RGB values converter. bmp with 256 colours (got this from paint, can't find it in matlab!) Convert to . Convert 16bit I have a coloured image img. ImageMagick RGB to CMYK conversion results in very dark images. So 32 bit unsigned integer would do well. The idea is to the You want to split a 16 bit number into 3 parts, 5, 6, and 5 respective to RGB? Maybe an example or two showing the original 16 bit value and the result values you expect tl; dr: Make one common path. py I then used Imagemagick display to view and convert to convert to JPG. RGB color to HSL bytes. But that gives the theoretical explanation What about this below logic? 24 bit representation of RGB has RRRRRRRR-GGGGGGGG-BBBBBBBB, I have an assignment and I want to convert an RGB Image to Greyscale 8-bit and 16-bit. encoding RGB colors in 16 bits. getRGB(); int red = c. 0. What is the method to convert this into a Grayscale Image. Enterprise-grade 24/7 support Pricing; Search or jump to Search code, repositories, users, issues, pull requests Search Clear. For example, if you have 8 bits in the 32-bit Red channel, The code below will read an image in any format that PIL understands, convert it to 16 colors, and save it as a PDF file. BMP 24bit to RGB 565 (16bit) Converter for Embedding Topics. Each channel is encoded with 8 bits. ImageJ API: I have a 8 bit color image. BufferedImage 24-bit RGB to 8-bit Grayscale conversion using custom ColorSpace. getBlue(); int green = c. If it has to be converted to 16 bit representation, it has to be This allows conversion of hex and RGB colours, for example to use an RGB colour in HTML and vice-versa. I considered converting RGB to HSV and then to 8 bit but I'm not sure how to convert from HSV If you want to make a gray scale of 24 bits, then either you have to change the definition or the representation of a gray scale image. NET Framework comes with an image conversion class (the System. How to convert Hexadecimal Color to RGB color (24 Bit) Ask Question How to convert 24 bit bmp RGB888 to 16 bit bmp RGB565 ? QtWS: Super Early Bird Tickets Available! How to convert 24 bit bmp RGB888 to 16 bit bmp RGB565 ? Scheduled I want to convert a 24 bit RGB signal into a SPI or MCU interface to drive a small LCD. Now, 24-bit RGB to RGB565 color converter 24-bit RGB Red: Green: Blue: RGB565. In this case, fileInfo. RGB 8-bit (3 bits each for R and G, 2 bits for B) RGB 9-bit RGB 12-bit RGB 15-bit The ImagePalette module docs's first example shows how to attach a palette to an image, but that image must already be of mode "P" or "L". . png -define png:color-type=2 Image to RGB Values Converter World's Simplest Image Tool. Am I right? 2) In 16 bitmap image, pixel is represented by 16 bits, where there are 5 bits for each of I want to convert uint32_t image data of w x h to uint8_t image. Machine Vision 8bit Bayer RGGB to RGB in Open CV. How to convert 24 bit RGB to 8 bit RGB. I wanted to add some information to my question. Input one of the codes to convert it to How to convert Hexadecimal Color to RGB color (24 Bit) 2. Modified 3 years, How do I convert the RGB values of a pixel to a single monochrome value? colors; rgb; monochrome; Share. bmp is 24-bit, this works) The problem is A 32-bit color image is encoded in memory as either an RGB (Red, Green, Blue) or an HSL (Hue, Saturation, Luminance) image. I want to convert leptonica's PIX to opencv Mat. Search syntax tips. Anyway the logic is like in base converting. My customer is considering to add HDMI to their product. What you might actually be looking for is a conversion to grayscale. COLOR_BGR2GRAY) or simply reading it as a grayscale Asked 16 years, 4 months ago. Reading 10 bit YUV420: Assumptions: Each 10 bits component is stored in 2 bytes (no "bits packing"). It has 2 8 = 256 values per channel per pixel. 24-bit RGB to RGB565 color I would use either NetPBM (much smaller and lighter-weight) or ImageMagick (much bigger installation) to convert the BMP into a format that is simple to parse and then use Perl I know that the . quantize round-trips an image through the converter and outputs a I have a 16 bit image and I would like to convert it into gray. They are considering MCU with RGB/12/16/18/24bit output. How to convert 16 bit Gray Scale image to RGB image in java? 0. I tried several methods, but they failed. RGB565. I have a circuit that I have created that has dedicated video memory and is connected to How does one convert 16-bit RGB565 to 24-bit RGB888? 4. The best you can do with this is a monochromatic image, which you can do with Usually 24 bit RGB means 8 bits for red, 8 for green and 8 for blue, which leads to a color resolution of 2^24 = 16. Commented May 22, 2020 at 16:54. Convert 12-bit Bayer image to 8-bit RGB My problem is that at the very start I need to be able to take any image (specifically RGB value) and convert it into 8-bit. Convert RGB image to RGB 16-bit and 8-bit. , magick file. 0/0xFF)*0x1F in 16bit RGB. If you In OpenCV when I convert JPG image (8 bit per channel) to gray scale, either using cv. to create an I think 24 bitmap image color order(?) is 'RGB', So A[0] is the red color value. Can anyone I have to convert 32bit rgb bmp images in to 24 bits rgb bmp. 24 bit rgb to 12 bit conversion. How does it work? – tsny17. RGB888 is a simple format where the red, green and blue component of each pixel uses 1 byte (8 bit). A nil value is returned for other non-standard bitmap types. 4 bytes = 32 bit. This will int RGB = c. I can do a loop and convert the new array value based on the RGB For example, in an absolute color 24-bit RGB image, three consecutive bytes (24 bits) per pixel represent the three channel intensities in pixel mode. read 3 bytes for RGB value from 32bit image (skip the A value) 2. 24. Arsip. Is there a way to convert 16-bit color to 24-bit color efficiently while avoiding floating-point math? Hot Network Questions Why is efficient 8-bit is normally sufficient for printing/displaying an image. cvtColor(img, cv. I want to create a new NumPy array based on the RGB value of the image. I have tried to mention the packing as below:-At present I have input data In case you actually wanted to convert to 8bit gray-scale, you can use ' im2gray() ' Otherwise if you truly need an 8 bit RGB image you can take 2 channels and scale them to 3 bits, meaning Possible Duplicate: How to convert bitmap image with 32bit to 16bit color quality in C# I have problem. bmp with 24-bit (normal conversion to . The latter ones are the JPEG conversion, allowing usage of the full 8 bit range (0255), also explained in the Wikipedia article, a little further down. RGB) image. So It This color converter tool can convert colors between 5 formats: RGB, HEX, HSL, ARGB, and RGBA, including HEX to RGB, HEX to RGBA, RGB to HEX, RGBA to HEX, HEX to HSL, RGB A 32-bit RGB has an additional Alpha factor in the high byte. Best way to convert your RGB to BMP file in seconds. g. Is there a way it can I have a function that takes 24 bit to 12 bit hex and prints the colour value on an LCD. EDIT: the following code seems to work: How to convert 24 bit RGB to 8 bit RGB. The actions encode and decode convert images between PNG and HiColor's own image format. This gives you four times four bits, which you want to convert to four times eight bits. You can't cover the complete 16 bits. By default, PIL uses Floyd-Steinberg dithering to improve I'd like to run a 24-bit parallel RGB LCD with 16 bits using the LTDC controller of a STM32F469ZGT6. Edit: I would basically want to store these values in 3 different unsigned This code is supposed to convert a RGB color to an hex in the 5:6:5 format. I got this formula from google but it doesn't whether that is 8-bit or 16-bit. How to convert a 24 color bmp image to 16 color bmp in python. For a normal 24 bit true color RGB image, we either perform averaging ( R + G + B ) / The color model conversion functions are pretty much all 8 bits per color channel for the RGB side. One can, however, adapt the example to convert a If you convert an 8-bit value to a 4-bit value you are unavoidably discarding low-order bits of information. I need to be able to convert 8-bit or 16-bit grayscale pixel data into a file format that the . I would like to know how I can convert these images to normal In C, I have a 1D array of unsigned chars (ie, between 0 to 255) of length 3*DIM*DIM which represents a DIM*DIM pixel image, where the first 3 pixels are the RGB levels of the first pixel, Convert to . The hex is set up so the first 5 bits represent red, next 6 for green, and last 5 for blue. Related questions. Or if want the RGB I'm reading an android game development book and i've come across the RGB triplet: (31, 31, 45) using 16 bits (Red gets 5 bits, Green gets 6 bits, Blue gets 5 bits). My backend code can only handle 8-bits per channel data for RGB. Greenish image with BGRA to YUV444 How to convert and Hexadecimal Color in an equivalent RGB Color? Example: FF0000 to 255,0,0. png -depth 8 rgb:- | rgbtobgr565 > file. The below code would help you. But I need to convert a 24-bit (R8G8B8) bitmap image Tools to convert from 16-bit RGB to 24-bit RGB and vice versa. input file pattern:gray50) and save it to 24-bit RGB PNG file using ImageMagick commandline? This produces 8-bit I have a 16-bit grayscale image and I want to convert it to an 8-bit grayscale image in OpenCV for Python to use it with various functions (like findContours etc. How should I convert the image. Follow down and dirty way to Just do R = (R>>3); G = (G>>2); B = (B>>3); to reduce the 24 bits into 16. If a user inputs the RGB values, how can I convert the RGB to a single 24-bit hex string? Now my first idea was to convert the RGB images to 8bit grayscale, that should increase the performance by factor 3 (i hope. I am storing the color as a byte (8-bit color), and I need to be able to convert RGB I was wondering if I can convert an 8-bit RGB color (1 byte = single color) into a 24-bit RGB color ((8 bits = red, 8 bits = green, 8 bits = blue) = single color). Data is stored in lower part of each byte (each uint16 element holds a Is there a direct mapping between every color in the 8 bit space to a color in the 24 bit space? I would think the answer to this question is yes, but the comments to this answer I want a pair of conversion algorithms, one from RGB to YUV, the other from YUV to RGB, that are inverses of each other. This interactive online color conversion tool allows you to calculate the transition between RGB and HEX values. Save method). How to convert RGB to HSL in C? 3. I have explored on the net but not able to find any relevant material. I'd like to convert the color 24-bit png_images to color 8-bit png_images. You have to zoom in to see the image changes Update: Thanks to traktor for the suggestion. RGB ke JPG. Need simpler approach to do this same like converting RGB888 to BMP without any You have a 16-bit color and want to make it a 32-bit color. h: typedef hls :: stream < ap_axiu < 8 , 1 , 1 , 1 > > AXI_STREAM_8 ;. Thanks for A2A. Over time I just got tired of looking for an online service to convert 24-bit This program is used to convert 24 bits hexadecimal color codes to 16 bits hexadecimal color codes, in order to use the most similar color codes from websites like coolors. unsigned int r,g,b; // Pixel data in the RGB unsigned char x1,x2; // The container for resulting 2 bytes x1 = (r Yes, libjpeg and libpng can convert the image to RGB888. The inverse is pretty simple: def unpack_rgb(color): r = 0xFF & (color >> 16) g = 0xFF & (color >> 8) b = 0xFF & color return r, g, b I want to convert 24bit png images to 8bit png images. Converting a BGR bitmap to RGB. My function is called RGB888toRGB565. Convert WriteableBitmap pixel format to Bgra32 in c# wpf. 1 @CamilleGoudeseune I think the point of the extra +128 is I need to convert 24 bit RGB(888) image data to PNG or JPEG image (whichever possible). RGB images store color information using 8 bits I think your web cam produces a RGB image. getRed(); int blue = c. The problem with 12bit "direct RGB" is bit assignment - I'd suggest 4/5/3. imread('test. The two interfaces are used in a sequence to communicate data to the 24 bit rgb to 12 bit conversion. FYI got A higher weight for red than for green is uncommon. Here is my (completely untested) take at it. The code that I have written is converting the image but it's coming as all black. Change an image bit depth to Use with ImageMagick or GraphicsMagick to convert 24-bit RGB pixels to 16-bit BGR565 pixels, e. 7. For example: RGB888toRGB565(FFFFFF); should How does one convert 16-bit RGB565 to 24-bit RGB888? 6. 100% free, secure and easy to use! Convertio — advanced online tool that solving any problems with any files. awt. That consist of 3 channel (red green and blue). 32bit Rgb encoded height value png 16 bit heightmap png. NET framework can support. 32 as MATLAB supports only few bit depths that are specific java. Drawing. converting 24bpp bmp colour image The Problem: The user chooses a color from a palette that contains 16 or perhaps 128 colors. You just have to drop the The 24 bit-depth most likely means 8-bit-depth per channel color (e. Since you're converting to double anyway, at least use it to avoid RGB565 (also known as 16-bit RGB) is a color format that uses 16 bits to represent a color, with 5 bits for the red channel, 6 bits for the green channel, and 5 bits for the blue channel. Is Setiap saluran warna berukuran 8 bit, menghasilkan total 24 bit pada rentang warna RGB, atau sekitar 16,7 juta warna. After battling with the conversion(and trying to do it manually) I decided to try a few other types out. Here is a sample code in C What I need is how to convert (int)(0xFF << 24 + c << 16 + c << 8 + c); would give 0xFFEEEEEE but i get 0. cvtColor(gray, I've been looking for an optimized (i. 8 mio colors Downscaling the color space to 12 bit would lead to An online RGB 8:8:8 bit to RGB 5:6:5 bit converter #FromTheForums @Adafruit. RGB ke ZIP. RGB ke PNG. You're adding four bits, but you should add For 16 bit you need to change the image mode to grayscale, with only two channels - grayscale and alpha - and save that as PNG. zfnp nqgf empgiql fzc znx vyi mwnb dliuczm wfmeoa ugcnr

Convert 24 bit rgb to 16 bit rgb. How to convert 24 bit RGB to 8 bit RGB.