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#1
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JPEG compression
My camera has various JPEG compression modes. The manual says that
higher compression means lower image quality, but I haven't seen any difference in the image quality of the two compression levels that I have been using: FINE (1:4) and NORMAL (1:8). However, I did see a signigicant difference in file size. What am I missing here? thanks |
#2
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James Ramaley wrote:
My camera has various JPEG compression modes. The manual says that higher compression means lower image quality, but I haven't seen any difference in the image quality of the two compression levels that I have been using: FINE (1:4) and NORMAL (1:8). However, I did see a signigicant difference in file size. What am I missing here? thanks Best option to see the difference is to shoot some text and see it - but usually you'll have to look it magnified, to see the difference. There's distortion around text. But i agree that there's barely noticeable difference between fine and normal, there's a bit more between normal and coarse(or low, whatever your camera says). Interesting point is that cameras use exactly opposite of usual words - usually it's said High as high compression (and so low quality), while all cameras have high as high quality... |
#3
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More noticeable on straight edges and fine detail - signs, textures etc.
Zoom in enough and you'll see the difference, but at 'normal' scales it's probably so minor a difference as to be negligible. Maybe becomes more noticeable if you have to lift the shadows too... Cheers, Jason (remove ... to reply) Video & Gaming: http://gadgetaus.com |
#4
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More noticeable on straight edges and fine detail - signs, textures etc.
Zoom in enough and you'll see the difference, but at 'normal' scales it's probably so minor a difference as to be negligible. Maybe becomes more noticeable if you have to lift the shadows too... Cheers, Jason (remove ... to reply) Video & Gaming: http://gadgetaus.com |
#5
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More noticeable on straight edges and fine detail - signs, textures etc.
Zoom in enough and you'll see the difference, but at 'normal' scales it's probably so minor a difference as to be negligible. Maybe becomes more noticeable if you have to lift the shadows too... Cheers, Jason (remove ... to reply) Video & Gaming: http://gadgetaus.com |
#6
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James Ramaley wrote:
My camera has various JPEG compression modes. The manual says that higher compression means lower image quality, but I haven't seen any difference in the image quality of the two compression levels that I have been using: FINE (1:4) and NORMAL (1:8). However, I did see a signigicant difference in file size. What am I missing here? thanks There are differences, but you might not be aware of them in any single photo. Try compressing a picture of your lawn at both compressions levels, and then compare them blown up onscreen to 200%. That should show you how they are different, and what effect excess JPEG compression has on the image quality. |
#7
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James Ramaley wrote:
My camera has various JPEG compression modes. The manual says that higher compression means lower image quality, but I haven't seen any difference in the image quality of the two compression levels that I have been using: FINE (1:4) and NORMAL (1:8). However, I did see a signigicant difference in file size. What am I missing here? thanks There are differences, but you might not be aware of them in any single photo. Try compressing a picture of your lawn at both compressions levels, and then compare them blown up onscreen to 200%. That should show you how they are different, and what effect excess JPEG compression has on the image quality. |
#8
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