Notes on life, art, photography and technology, by a Danish dropout bohemian.
When you drink the water, remember the river.
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Thursday, November 27, 2008
Photoshop oddity
When I do a batch of photos in Photoshop and it has to 'save and close' or save in a folder, it will stop and ask about JPG compression... but only on some of the pictures! Does anybody know why and how to control it?
If the picture was previously saved by Photoshop it will not ask about compression but will use the previous value. Beware, this may lead to substantial degradation of quality if you open, save, close, open - save. The detail loss in this scenario will be applied twice. If you open and then save several times without closing, then do not worry, the screen buffer of the image is not degraded by the compression, you may save JPG with 60% for the web and then (without closing!) save TIFF and no data loss will occur.
If the picture was previously saved by Photoshop it will not ask about compression but will use the previous value. Beware, this may lead to substantial degradation of quality if you open, save, close, open - save. The detail loss in this scenario will be applied twice. If you open and then save several times without closing, then do not worry, the screen buffer of the image is not degraded by the compression, you may save JPG with 60% for the web and then (without closing!) save TIFF and no data loss will occur.
ReplyDeleteThus, never open a JPG in Photoshop. Only open TIFFs and PSDs, and save as these as well as JPGs to preserve your work.
ReplyDelete