Problem with "Preview" and Jpeg compression

Question

Level 1

33 points

Problem with "Preview" and Jpeg compression

Hi all,

i got a problem with the new OS Big Sur:

Normally i use "Preview" not only for change the images format but, also, for change the JPEG compression.

When I try to change the JEPG compression, whatever percentage I decide the file size doesn't change. Before i was able to see the preview regarding the compression/file size, actually i cannot see nothing even if I move the compression to 10% (for example) and save the file, the file will have the same size as the original as if the compression was not active.

I tried in 2 different Mac, same things so i'm not the only one. Any idea?

Best regards,

MacBook Pro

Posted on Nov 16, 2020 3:22 AM

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Answer 1

Dec 8, 2020 12:33 AM in response to Federicoso

You can open the image in Preview and go Tools > Adjust size... to manually adjust the definition of the picture. The estimated file size is correct in that panel.

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Answer 2

dialabrain

Level 10

135,389 points

Dec 8, 2020 12:59 AM in response to Federicoso

You can file a bug report from the feedback page.

Feedback - macOS - Apple

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Answer 3

Dec 15, 2020 2:15 PM in response to dialabrain

The bug still persist in Big Sur 11.1 :/

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Answer 4

Federicoso Author

Level 1

33 points

Nov 22, 2020 8:57 PM in response to Federicoso

I spoke with others and we are all in the same situations plus, why they change the graphics like that? How is possible to see the percentage or the scale regarding the compression? If i have to replicate the same compression with different images?

Left the old Preview, right the new Preview.

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Answer 5

dialabrain

Level 10

135,389 points

Dec 8, 2020 12:52 AM in response to Federicoso

Federicoso wrote:

Correct, but my problem/question is the "compression" not the dimension. Regarding the compression the problem still there and i don't think they will correct.

It certainly won't be corrected before the next point release of Big Sur.

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Answer 6

Federicoso Author

Level 1

33 points

Nov 20, 2020 7:14 PM in response to Lucky_93

Hi! Finally... i think i was crazy but i'm not the only one... i pray for a quick solution, is very annoying.

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Answer 7

Federicoso Author

Level 1

33 points

Dec 8, 2020 12:36 AM in response to 大苹果

Correct, but my problem/question is the "compression" not the dimension. Regarding the compression the problem still there and i don't think they will correct.

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