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12-08-2004, 09:54 PM
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Save For Web... 1 Quality point - big jump in file size Post #1 | | Guest |  Save For Web... 1 Quality point - big jump in file size
This is a 'wonder out loud' sort of question. I've noticed that when using the Save for Web... feature there is a place on the Quality slider where one point makes a disproportionately large jump in file size. It seems to me it is always at 50-51 but I'm not positive of that. Here are some results from a Save for Web... this morning.
47 = 226.7K
48 = 230.1K
49 = 236.2K
50 = 239.8K 51 = 298.2
52 = 300.5
etc.
I wonder why that sharp jump exists when files grow fairly proportionately above and below that 'break point." Needless to say I always keep an eye out for that issue when saving for web.
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12-09-2004, 02:17 AM
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Save For Web... 1 Quality point - big jump in file size Post #2 | | Joe Blow
Join Date: Mar 2004
Posts: 0
Rep Power: 0 | Save For Web... 1 Quality point - big jump in file size
I can't be sure, but when you slide that arrow--for me, the changes come at the 30, 60 and 80 marks! Also if you notice the general settings to the left of the slider bar -- when you get those changes at those marks, the general attribute changes too -- low, 0-29; medium, 30-59; high, 60-79; maximum, 80-100. These were the settings for JPEG -- as for the other ones, I haven't figured them out yet.
As to why this happens -- I don't know, I would think this is just a compression thing! [confused]
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12-09-2004, 03:08 AM
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Save For Web... 1 Quality point - big jump in file size Post #3 | | Guest | Save For Web... 1 Quality point - big jump in file size
I don't generally use the slider but enter the numbers manually. Perhaps that's because my entries are generally between 40 and 60, rarely above or below those figures.
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12-09-2004, 04:01 AM
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Save For Web... 1 Quality point - big jump in file size Post #4 | | Newb
Join Date: Jul 2003
Posts: 12
Rep Power: 0 | Save For Web... 1 Quality point - big jump in file size
You have to use multiple photos to test this guys -- with varyious types of visual conetnt. Every photo will yield different percentages. It's based on the amount of continuos-tone qualities in the photo/image.
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12-09-2004, 05:20 AM
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Save For Web... 1 Quality point - big jump in file size Post #5 | | Guest | Save For Web... 1 Quality point - big jump in file size
Aha! Exactly right, Mark, and comprehensible too! Chris Cox of Adobe answered " Because at some point the JPEG coefficients change, and chrominance subsampling changes, and because some images will have details that drop out at different quality values." :B
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12-09-2004, 05:44 AM
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Save For Web... 1 Quality point - big jump in file size Post #6 | | Joe Blow
Join Date: Mar 2004
Posts: 0
Rep Power: 0 | Save For Web... 1 Quality point - big jump in file size
Well, like my late Grandma used to say "You learn something new everyday -- that is if you are willing!" I can say that I have just learned something new! I wasn't aware of the differences in different types of pictures other than file extensions and that PNG and GIF allow you to save with bg transparencies!
Thanx for the knowledge Mark & Welles!  | |
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12-09-2004, 03:54 PM
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Save For Web... 1 Quality point - big jump in file size Post #7 | | Newb
Join Date: Oct 2003
Posts: 21
Rep Power: 0 | Re: Save For Web... 1 Quality point - big jump in file size
Quote: |
Originally Posted by Welles This is a 'wonder out loud' sort of question. I've noticed that when using the Save for Web... feature there is a place on the Quality slider where one point makes a disproportionately large jump in file size. It seems to me it is always at 50-51 but I'm not positive of that. Here are some results from a Save for Web... this morning.
47 = 226.7K
48 = 230.1K
49 = 236.2K
50 = 239.8K
51 = 298.2
52 = 300.5
etc.
I wonder why that sharp jump exists when files grow fairly proportionately above and below that 'break point." Needless to say I always keep an eye out for that issue when saving for web. | Very interesting welles, I actuallly have used the save as for web function for years and never noticed that.
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