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F-Lexx
No. Not the size. This is a value of estimation of visual difference between the original and compressed image.
There is hyperbolic like dependence of size on quality. For example, 96% image is about twice size of 95% image, but 10% and 11% will have very close sizes. But the real size depends on complication of picture, so you can get in 550 KB a simple picture with 95% quality or a very complicated picture with for example 70% quality.
My driver always sets highest possible visual quality fitting the resulting picture in given memory limit.
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Posted: 2007-06-16 22:21:14
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On 2007-06-16 19:04:35, SPU wrote:
sarmadgilani
Why don't have higher quality if we can? File size remains about 500-600 KB in any case, because now the quality is dynamical thing.
You want small files? Turn off Fine mode and you'll get files about 200-300 KB, but the quality is still dynamical and still can be very high on simple scenes.
Outrageously large file sizes do not necessarily correlate to higher quality.. I honestly can't tell the difference between a shot at 89 compression versus 92, for instance. The file size goes up very much, but I don't think it's worth it.. just wasting space. I have a 4 GB stick so file size doesn't matter to me, that's why in my drivers I've set it to 89 compression.. beyond that, I don't see much benefit.
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Posted: 2007-06-16 22:56:22
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sarmadgilani
Take this utility
http://www.impulseadventure.com/photo/jpeg-snoop.html
and inspect your photos. I think you'll be surprised
[ This Message was edited by: SPU on 2007-06-16 22:21 ]
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Posted: 2007-06-16 23:20:53
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This pics I took after flashing my k750 to w800 with sarmads 5.7 sharpness from 5 to 4
your opinion please
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Posted: 2007-06-17 01:46:22
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Yeah, I've seen jpeg snoop before, thanks for the link. I understand your point, but I'm talking about the picture itself, and how it looks on the screen. I don't see much difference in how the pictures look, and in the end that's what really matters.
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Posted: 2007-06-17 02:45:34
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@sarmad
I know what you mean mate but there are a few simple reasons why you would want a Jcomp closest to 100%.
1) Lower number of artifacts. This you will notice more on night shots and shots of the sky.
2) If you decide to take prints of your photos the higher the comp the better.
3) JPEGs are already a highly compressed format which in turn is a compromise on quality so why would wanna further deteriorate the quality...
4) You can make out the difference between 2 very well taken shots, one at 88% and one at 95% Jcomp. You may need an lcd monitor to notice it though. I have a 20.1" widescreen and the clarity difference is pretty noticeable.
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Posted: 2007-06-17 05:01:42
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On 2007-06-17 05:01:42, radicalgel wrote:
4) You can make out the difference between 2 very well taken shots, one at 88% and one at 95% Jcomp. You may need an lcd monitor to notice it though. I have a 20.1" widescreen and the clarity difference is pretty noticeable.
ok cool, i'll take your word for it.. my laptop screen isnt good enough to see the difference, hehe. this gives me something else to work on, so i guess there will be a 5.8 driver after all...
has anyone had any problems with the higher comp settings.. like any stability issues?
[ This Message was edited by: sarmadgilani on 2007-06-17 05:30 ]
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Posted: 2007-06-17 06:28:38
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sarmadgilani
Really you can get a crash even on 80% if it will be locked... but you can't lock it, you can set upper limit only.
To avoid crashes you need to know how the jpeg encoder works with settings you provide in driver.
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Posted: 2007-06-17 07:23:32
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On 2007-06-17 07:23:32, SPU wrote:
sarmadgilani
Really you can get a crash even on 80% if it will be locked... but you can't lock it, you can set upper limit only.
To avoid crashes you need to know how the jpeg encoder works with settings you provide in driver.
right, all we can do is set an upper limit since its dynamic and not set to one compression value every time.. interesting, i'll have to look into this more, i just wish i had the time to sit down and test all this out... although my guess would be the trick lies in determining the right parameters for the min, max, and avg values for the SET_JPEG macros.. although it would have to be dynamic, so needs a bit of testing.. which is horrible on the W810 since it takes several minutes just to upload and test a driver...
[ This Message was edited by: sarmadgilani on 2007-06-17 06:48 ]
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Posted: 2007-06-17 07:42:25
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On 2007-06-17 06:28:38, sarmadgilani wrote:
On 2007-06-17 05:01:42, radicalgel wrote:
4) You can make out the difference between 2 very well taken shots, one at 88% and one at 95% Jcomp. You may need an lcd monitor to notice it though. I have a 20.1" widescreen and the clarity difference is pretty noticeable.
ok cool, i'll take your word for it.. my laptop screen isnt good enough to see the difference, hehe. this gives me something else to work on, so i guess there will be a 5.8 driver after all...
has anyone had any problems with the higher comp settings.. like any stability issues?
[ This Message was edited by: sarmadgilani on 2007-06-17 05:30 ]
No for me is good take pics with higher quality PD. if u can in u next driver increase the color level thanks so much and greetings see ya later
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Posted: 2007-06-17 07:44:36
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