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by Andrex
1723 days ago
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In short, image files don't include all RGB colors. They basically include a line like "usesColorSpace: 'RGB'". Only the decoder needs to know how to interpret the RGB colorspace. When you save in image in JPG, it's compressed using an algorithm that gets it "pretty close" to the source image. The software doing the JPG decoding (browser, image viewer, etc.) basically reverses this algorithm to display the image back to you. For JPG, this compression is "lossy" and so you've lost detail from the original source image. PNG is a lossless image format, but it basically works the same way without sacrificing the source image's quality. The "standard" for an image format dictates how an encoder creates the image and how a decoder displays the image. Since everyone is "on the same page," the individual image files only need to contain what they need to -- basically, "this pixel = RGB(0,1,2)". Hope this makes sense and helps. |
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