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Author Topic: Lossless crop  (Read 5054 times)

Offline mhartmann

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Lossless crop
« on: May 07, 2014, 02:24:30 AM »
Any chance to get lossless crop tool?
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Offline Hayo Baan

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Re: Lossless crop
« Reply #1 on: May 07, 2014, 03:18:02 AM »
What do you mean with a lossless crop? The crop of PhotoMechanic never throws out pixels so it is already lossless...
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Offline mhartmann

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Re: Lossless crop
« Reply #2 on: May 11, 2014, 02:11:10 PM »
As far as I understand, PM is creating a new JPG file with compression applied. The quality slider proofs that.
Faststone Image Viewer has an option to lossless crop the JPG without rewriting the file and do all the JPG magic to it.
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Offline Kirk Baker

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Re: Lossless crop
« Reply #3 on: May 11, 2014, 02:31:09 PM »
Quote from: mhartmann on May 11, 2014, 02:11:10 PM
As far as I understand, PM is creating a new JPG file with compression applied. The quality slider proofs that.
Faststone Image Viewer has an option to lossless crop the JPG without rewriting the file and do all the JPG magic to it.

Lossless JPEG cropping can be done in only some cases (the crop has to be rectilinear and must fall on JPEG DCT block boundaries) and never when the crop is rotated.  PM would have to offer a special 'mode' where the crop is constrained to lie on boundaries that always work.  It's not something we ever plan on doing.

If you're worried about generational loss, save as PSD or TIFF.

-Kirk
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Offline mhartmann

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Re: Lossless crop
« Reply #4 on: May 12, 2014, 02:58:59 AM »
Make sense. Thanks Kirk!
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Offline Hayo Baan

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Re: Lossless crop
« Reply #5 on: May 12, 2014, 04:56:40 AM »
I indeed misunderstood the question, you were referring to lossless cropping when applying the crop in e.g. a save as action. Then indeed PM will resave the jpg and you will lose (some) quality. Anyway, as Kirk said, better use psd or tiff in these cases.

By the way, to my knowledge the 90 degrees rotates of jpgs have been implemented lossless so you're ok with those :)
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