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Poll

which quality level do you save your JPG files at

12
117 (88%)
11
8 (6%)
10
6 (4.5%)
9
0 (0%)
8
0 (0%)
lower than 8
2 (1.5%)

Total Members Voted: 110

Author Topic: Which quality level do you save your JPG's in  (Read 17682 times)

0 Members and 1 Guest are viewing this topic.

lisafx

« Reply #25 on: November 12, 2009, 11:24 »
0
Racephoto's comparison settled the issue for me.  I was surprised by the difference in the two images. 

Gonna keep saving at 12.


« Reply #26 on: November 12, 2009, 17:01 »
0
As already said, storage is cheap.

I always save a PSD, at original size, and to JPG at 12 - if I have to re-edit, I work from the PSD.  I never resave a JPG.

And if that's not feasible, I've still got the RAW.

« Reply #27 on: November 12, 2009, 22:14 »
0
If you dig into the JPG compression algorithm, you will see that the information reduction is done by combining slightly different adjacent pixels into monochrome squares > 1px. When there is a lot of noisy info in the image, like in trees or grass, the size reduction is much smallerr than with clouds or scenes with many slow gradients, like cars.

One of the JPG quality parameters is the size of the squares.

It follows that you can see a clear effect in slow gradients like skies and clouds (where you can easily see the JPG square artifacts in medium-blue clouds) and on high-contrast luminance edges like dark suits on an overwhite. JPG is bad handling graphics and hence the edges on overwhites, which will show up with more jitter around the edge and into the white area near the border.
This can cause problems for a designer-buyer that wants to re-extract the object from the white.

Conclusion: q12 for overwhites and rasterized graphics, q10 for the rest.

Poncke

« Reply #28 on: February 16, 2013, 05:18 »
-1
12

Microbius

« Reply #29 on: February 16, 2013, 05:45 »
0
Old thread alert!

Poncke

« Reply #30 on: February 16, 2013, 06:02 »
-2
Old thread alert!

So what, the poll and the question is still relevant??

RacePhoto

« Reply #31 on: February 16, 2013, 10:04 »
0
That and I should get a better photo to do the comparison test. The gull wasn't the best choice. But it does show that if there are any minor problems with the image, it makes a difference. I still same Micro at 10 but I should be at 11. The difference gained going to 12 isn't significant. So how's that for a survey answer? Yes, 10 - 11 and sometimes 12.  ;D

It's another one of those, it depends things.

Let me be more specific, large panorama that's 54MP to start with and I can see peoples faces full size a quarter mile away, 10 is just fine. For Microstock 4-6MP images, 10 is just fine. For Alamy I often save at 12. And for myself, editing I stick to TIF and final save is at 10.

Like I said, I should be saving all those at 11 and get over the differences. Disk space isn't that expensive anymore and high speed isn't like when I was using dial-up! I'm logically flawed and stuck in the past...


Old thread alert!

So what, the poll and the question is still relevant??

« Reply #32 on: February 16, 2013, 18:28 »
+1
As already said, storage is cheap.

I always save a PSD, at original size, and to JPG at 12 - if I have to re-edit, I work from the PSD.  I never resave a JPG.

And if that's not feasible, I've still got the RAW.

Exactly how I work.  I try not to go back and edit a JPG, rather the PSD.  And where I really may have screwed the pooch, I will start with the original RAW file.

« Reply #33 on: February 16, 2013, 18:33 »
0
I had to change my answer.  I now save files at Q12.  not because I can see a difference but because there is no reason not to. 

w7lwi

  • Those that don't stand up to evil enable evil.
« Reply #34 on: February 16, 2013, 21:18 »
0
I had to change my answer.  I now save files at Q12.  not because I can see a difference but because there is no reason not to.

Agree completely.  I save my master images as TIFF files only because they appear as thumbnails while PSD files do not.  If any editing needs to be done, it is always on these.  The JPEG file that is to be submitted is always saved at quality level 12 because, as Leaf says, there's no reason not to.  Memory is dirt cheap.  I've a two terabyte HD in my computer along with multiple terabyte external drives for back-up.  And with high-speed internet, uploading is rarely an issue.  The only time I've had to resort to lower quality on my JPEG's is when the file size is too large to meet the agency's limit.  I had a JPEG file that I wanted to upload to Alamy, but it was around 75mb at quality level 12, even though it was only 5000 x 5000 pixels (very high color saturation).  Had to save it at level 10 to get it small enough to meet Alamy's maximum limit.

tab62

« Reply #35 on: February 16, 2013, 21:38 »
0
This survey really was a landslide in favor of 12 for sure! This 12 wins the election for another 4 years...

« Reply #36 on: February 16, 2013, 22:21 »
0
Yikes! Now I feel bad saving my illustrations JPGs at 11.

« Reply #37 on: February 18, 2013, 18:42 »
+1
Hi All,
 I save at 12 and I save the 100 mg. 16-bit psd as well. Here is a link that might be of some interest to everyone about the myths and truths of jpegs. http://graphicssoft.about.com/od/formatsjpeg/a/jpegmythsfacts.htm Hope this is of help.

Cheers,
Jonathan

Poncke

« Reply #38 on: February 18, 2013, 18:46 »
+1
Hi All,
 I save at 12 and I save the 100 mg. 16-bit psd as well. Here is a link that might be of some interest to everyone about the myths and truths of jpegs. http://graphicssoft.about.com/od/formatsjpeg/a/jpegmythsfacts.htm Hope this is of help.

Cheers,
Jonathan
Cheers Jonathan.


 

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