Without knowing the make and model of the camera this is only a guess, but I would say it's either the image quality or image compression for the JPEG files.
Just about every camera stores photos as JPEG files (many cameras also offer other options, but JPEG is almost universal). JPEG uses a lossy compression scheme. This means that files are compressed to save space on your memory card. This compression throws away some data. Usually this is not noticeable. For example, if one point of a blue sky comes out a different shade of blue (but still close to its neighbors). It would be noticeable if a patch of sky came out green, however.
High image quality applies minimal compression, at the expense of file size. Low image quality applies more compression, saving file space but sacrificing quality.
Compression is the other way around. High compression saves file space at the expense of quality. Low compression gives higher quality at the expense of file space.
Whether these settings on your camera determine the image quality or the image compression, I can't say. You'll have to look in the manual for your camera.
If you require further assistance, please add a comment to this question and specify the make and model of your camera.
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