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Image ProcessingImage quality comparison, please

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LindaShorey
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Image quality comparison, please

Post by LindaShorey » Mon Jan 15, 2018 8:52 pm

New computer + newest PS Elements, oh boy!

#1 - my usual resize
#2 - "save for web" option in PSE (no exif)

Any difference to those of you with sharp eyes?

Thanks much!
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1 no psd P1100106 resize.jpg
1 no-psd-P1100106-web.jpg
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Post by Duck » Mon Jan 15, 2018 11:30 pm

The biggest difference I notice is the first one has more contrast in both luminosity and color.

I notice shadow contrast in the dark area of the loft through the opening at top. The rafters are more visible in the second image. You can also see the contrast in the clouds. As for color contrast, that's noticeable in the color tones of the barn itself; roof, sides... even the grasses.

My preference is the lower image.

Hope this input helps.
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Post by St3v3M » Tue Jan 16, 2018 7:05 am

LindaShorey wrote:
Mon Jan 15, 2018 8:52 pm
...
Any difference to those of you with sharp eyes?
...
It looks like the top has a little better definition of the color and contrast but when I open them in separate tabs and flip between the two I don't see any real difference. If I didn't know better I would say they are the exact same image. S-
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LindaShorey
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Post by LindaShorey » Tue Jan 16, 2018 2:09 pm

Duck, thanks so much. You must be viewing on one of those 32" 4k screens! :) Also, I'm reminded of an older tv show on HGTV with David Bromsted (a painter/decorator). He could go into a store, see a pillow and say it was the perfect color for the room. Does your artist's background enable you to discern subtleties in color and contrast more readily?

Steve, it is the same image re-sized two different ways. There is a 20 kb difference in file size, but on my screens (15.6" laptop and 13.3" Chromebook), I can't tell the differences that eagle-eyed Duck can find.
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Post by Charles Haacker » Tue Jan 16, 2018 2:35 pm

Like you, Steve, I have both files open in tabs as I always do so I can toggle between them. I can see absolutely NO difference between them. I also thought perhaps they were the exact same file but I checked very carefully and see the different ID's on them, the second one Saved For Web (I've never used that, by the way; I think it just downsizes them).

I even went downstairs and opened them both on my big, calibrated-every-month machine. Toggle, toggle, toggle... No difference. Not no discernible difference; NO difference. No difference in shadow contrast. No "more visible rafters." No "different color contrast," nuthin'.

My eyes are 75 going on 76 plus I have had two surgeries on the right so there's that... :|
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Post by LindaShorey » Tue Jan 16, 2018 3:03 pm

Charles Haacker wrote:
Tue Jan 16, 2018 2:35 pm
Like you, Steve, I have both files open in tabs as I always do so I can toggle between them. I can see absolutely NO difference between them....
Thanks so much for checking, Chuck. One difference with "save for web" is it strips exif. And now that I have a new laptop which, for now anyway, I'm keeping online, I decided to compare colors with the HP Chromebook (I could dig out my Toshiba too, and really have a ball, ha) - when viewing on websites such as pM.

While my own aging eyes see almost no difference in clarity and brightness, the Chromebook appears to show blues as more cyan than the Asus laptop.
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Post by Duck » Tue Jan 16, 2018 6:50 pm

I decided to do some more reliable exploration of the images. When I was viewing them on my laptop, at night, in lower light, while reclined, the top image looked more contrasty. Viewing the same images on my work computer (where I'm writing this from) the two images look identical, leading me to question things.

Taking point samples from both images at various parts of the image shows no perceivable difference. Overlaying the web over the resized image and applying a difference layer blend shows they are both almost identical identical; So close it's not worth mentioning. On pixel peeping though, I find there is slightly more noise contrast in the web version over the resized version. Again, so minor it's not really worth mentioning as the emphasis is on slight. The majority of what I saw as different was the compression artifacts of the JPG, which is normal. Each had slightly different artifacting going on but it was more similar than different and also not really worth mentioning.

Overall, I take back my earlier comment as it was probably due to viewing angle differences rather than actual physical differences in the files.

Hope this new analysis helps. :thanks:
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Post by Duck » Tue Jan 16, 2018 6:52 pm

LindaShorey wrote:
Tue Jan 16, 2018 3:03 pm
[...] While my own aging eyes see almost no difference in clarity and brightness, the Chromebook appears to show blues as more cyan than the Asus laptop.

Different uncalibrated monitors from different manufacturers (and different ages) will have variations in color temperature.
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Post by LindaShorey » Tue Jan 16, 2018 7:56 pm

Duck wrote:
Tue Jan 16, 2018 6:52 pm
LindaShorey wrote:
Tue Jan 16, 2018 3:03 pm
[...] While my own aging eyes see almost no difference in clarity and brightness, the Chromebook appears to show blues as more cyan than the Asus laptop.

Different uncalibrated monitors from different manufacturers (and different ages) will have variations in color temperature.
Yeah, and I'm not yet ready to purchase and use a calibration device ;) Thanks for taking a second look at the pics! It is quicker for me to just do a re-size, plus it keeps the exif for people to peek at. So I'll keep on a truckin' in that direction.
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Post by Charles Haacker » Tue Jan 16, 2018 9:01 pm

I had no idea what Save For Web did. I found this explanation: https://photography.tutsplus.com/tutori ... -cms-23080 The summation:
Saving images for web is a compromise. You want your image to load quickly, not take up too much space (this is particularly a consideration for third party websites like Facebook and Twitter who simply don’t allow large sizes) and still look great. With Save For Web you’re able to fine tune an image for web much more accurately than before, carefully balancing that compromise between compression/size and quality. Get it right, and you’re a step ahead of the game for all those still throwing full size images into their websites, profiles and portfolios and letting the software take best guess.
It's been available in Photoshop and Elements for as long a I can remember but I never used it because I didn't know what it did. Maybe now I'll give it a try. :)
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