Convert 16x16 true-color image of palette colors, to actual palette file

Question

Background: I'm trying to look through assets in an old game's archive files. They're 8-bit. I need a palette for them to look correct. I have the palette. DxWnd supports dumping the active palette. However, the palette is in the form of a dialog with 16x16 colors (=256) stretched. [updated to include actual output] I then shrunk them to single pixels-per-color. So now I have a 16x16 (true color) bitmap. I want to get a palette file from that. I don't know if there's a standard format for palettes, or it's just plain-old-data of (256*3 for RGB) bytes. GIMP supports a palette format that you can import when importing "raw image data". So, the question is: What would be the easiest way to convert this 16x16 image of true-color values to a block of 3x256 bytes palette? Whether it's tools, or Python, C/C++, or whatever. The point is, this is a minor issue ("wrong data format"). So if some existing tools (Linux or Windows) can use it, by all means. To be absolutely clear: This isn't a sprite. It doesn't need to be heuristically converted to some "best fit" palette. It's literally the palette. [edit] I tried, per the comments, to output the palette from GIMP and IrfanView, but I get this, jumbled set of colors instead: JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

ImageMagick will give a raw, 256*24bit RGB image that GIMP can use as a palette when opening a raw image from your image like this: convert UEw8E.png -resize '16x16!' -filter point -depth 8 palette.rgb (The ! means to force the size, regardless of aspect ratio, needed as your image is not a square. -filter point skips downscale filters. -depth 8 forces 8 bits per colour. Although your image already is 8 bits per colour, it's good to know for certain which format it will output.) The file created, palette.rgb, is a raw array of the 8 bit per colour (24-bit RGB) palette from your image, left to right, top to bottom. (which, I think you were asking for) Now opening any raw image with GIMP (tested with 2.8.22), with the settings Image Type: Indexed Palette Type: R, G, B (normal) Palette File: palette.rgb The palette inside GIMP looks like this (everything is in the same order as in your image):