Gradual increasing gives 32 bits, but never 8 bits. Neither image.Depth = 8 nor image.BitDepth(8) works. = CompressionMethod.NoCompression īyte result = image.ToByteArray(MagickFormat.Bmp) When you convert an image to index color, a color table gets built to store and. To fix this, you can disable compression so the bit depth value displayed in the properties dialog will be the value you expect. Index This mode produces 8bit image files with up to 256 colors. Unlike Magick.NET's defaults, it seems that Paint.NET produce uncompressed BMP files, that's why you see different bit depths due to weirdness of Windows Explorer. The same image reduced to a palette of 16 colors specifically chosen to best represent the image the selected palette is shown by the squares at the bottom of. Therefore, I can say that there's no problem with the image you produced with Magick.NET, it's certainly an 8bpp BMP image file, but compressed. Also, the next byte 01 (offset 30) means that the data compressed with Run-length encoding which is a straightforward lossless data compression algorithm. There are 10 color palettes available: Exact. I don't know it's a bug or not but I'm a little bit closer to call it a bug.īecause after creating a 8bpp BMP file with your code, when I open the file with a binary editor, in the bitmap header struct I saw that the bits per pixel field value (blocks 28-29) was 8 as it must be. Specifies the color palette to apply to the indexed-color image. You can also create your own custom color scheme. This will open up your Color Palette which will allow you to choose from a variety of colors or you can choose from the ready-made color schemes. Windows Explorer displays all compressed BMP files as 32-bit contrary to their actual bit depths. To do so, you need to open your PNG file in Canva and click on the ‘Colors’ option in the left-hand sidebar.
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