Any love for GIMP ?

Started 4 months ago | Discussions thread
charlyw64 Regular Member • Posts: 450
Re: Any love for GIMP ?

CAcreeks wrote:

charlyw64 wrote:

CAcreeks wrote:

One great feature of GIMP, entirely lacking in Photoshop, is GIMP's ability to ascertain the quality and chroma settings of a JPEG, and save at the same values. This helps reduce JPEG artifacting, which can get really terrible as Q levels change.

Furthermore GIMP is able to save 2x1 chroma subsampling, which is what most digital cameras produce. Photoshop cannot.

Neither of those are necessarily good things. JPEG are a poor choice for intermediate storage (which is the singke way to get strong accumulative compression losses) and 2x1 subsampling is far from optimal - in a camera that's acceptable because that usually is executed in hardware (more modern cameras will switch to video compression schemes because they are also executed in hardware and more efficient than JPEG).

What if all you have is the JPEG?

Most waterproof cameras are not Raw capable, and most cellphone owners shoot JPEG of HEIC/HEIF (iPhone).

Nothing forces you to use the input format as intermediate storage which would be the only way to further degrade the image.

Sorry, I have no idea what you are talking about.

Original image is JPEG, edit to post on Web is JPEG. There is no intermediate format.

You don't get compression degradation if you don't go through multiple save to jpeg, edit and save to jpeg cycles...

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