Hi to all,

I have a problem about floating pixels when saved as JPEG on isolated photos.

I process with adobe camera raw, photoshop and finally convert it to JPEG. But even if i detaily clean all the edges, when saved as jpeg there becomes floating pixels around the edges. (when i push levels all the way right)

How can i avoid this?

jpeg artifacts are particularly bad on edges, especially when there's an high contrast

basically you can't avoid it, but you can reduce it by saving .jpg at highest quality: not only at the highest level, but also choosing 4:4:4 instead of 4:2:2 subsampling

also, some compressors are better than others in any particular situation, so you may try to save as .tif and then convert to .jpg with another tool

I have many TIFF files (that's what I work on) with perfect white backgrounds, yet when saved in JPEG, even at the smallest compression, they show some stray pixels. Some are even illustrations, so there is no isolation issue to be fixed.

This has been discussed here many years ago, in a thread exactly about this (I think I even started it). It's just something inevitable in the algorithm and sometimes an inspector will make an issue about this.

BTW, clipping paths will only be useful at the original size, so they are not a solution or circumvent to the problem.

Thanks for the correction. I remember having read here that all sites would remove the clipping path in smaller resolutions, something the in automated process would not be able to retain that informartion.

@lthn:

The reason you push the Levels all the way, is to check for floating pixels that might not be evident at a normal exposure. You don't actually save that level change, just observe.