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I have a 24-bit image. I need to convert it into an 8 bit JPEG image. Can it be done by MS Paint or MS picture manager or I need to download any tool. I tried some tool but that did not work.

Will an 8 bit image become black and white or it remains coloured?

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8bit means 2^8 colors = 256 colors, just select Save As on MSPaint and then 256 Colors Bitmap. As far as converting it to JPEG... After saving it as 256 colors .bmp, open it and then save as JPEG, but I don't know what the results will be. I believe Adobe's Photoshop and GIMP (free) have the option of saving 8 bit jpegs.

It won't be black and white unless you make it black and white.

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However, if you do make it black and white, it will be just as high quality as the original, just without color. A 256-color image will be significantly degraded in quality unless the image really didn't have (much) more than 256 colors to begin with. –  trlkly Jul 3 '14 at 19:22

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