Forum Moderators - Quality of images posted - something is happening
dcarr
Posts: 9,454 ✭✭✭✭✭
I recently posted an image on the forum and I noticed that, as displayed in the forum, the contrast and color saturation was reduced. The image below shows the original image (top) and a screen capture of that exact same image as it appears in a discussion. Note that this comparison image also suffers from the same problem. So to see it as it really is, right-click on the image to "Open Image in New Tab", and then view that tab.
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in the op on the forum thread i see 2 different colors and the same when opened in a new tab
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Correct. But the image shown above (the bottom one) is doubly-compressed.
When viewed in a new tab, the top image is the original. The bottom image is a screen capture of what that same image looks like after posting.
In other words, whenever an image is uploaded, the normal posted image of it has the contrast and color saturation reduced. The only way to see the full contrast and color is to view the image in a new tab.
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both images - in thread and in tab - look exactly the same
oh. you mean when only you open it in a new tab
i see in my post the pic is the same as op
Look at my image posted above at the top (NOT in a New Tab).
Then start up another instance of your browser. (I have two Firefox browsers running concurrently).
In the newly-started browser, open and view the image in a new tab.
Compare the two side-by-side.
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When I view the image you posted in a new tab, the upper one matches the original (before uploading).
But as displayed in your post (NOT in a new tab), the image contrast and color saturation is reduced from what the original image had. But when I open the image you posted in a new tab, I see the original contrast and color in the top image.
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same op pic. new tab current browser. right new browser and new tab
firefox
I see that your images are saved as AVIF files. Did you upload them in this format, or did the forum software convert them? I suspect the problem lies in the format, or possibly in the way the format is interpreted on your browser, or how it's interpreted by the forum software. I've never trusted using AVIF.
http://macrocoins.com
Seems there’s been a recent change in how the forum handles the format of uploaded images. For example, if you check any recent threads, you’ll notice that saved image files now use the .avif extension. Versus older threads,(before members started reporting issues with image uploads) used the .webp format. In a nutshell, .avif offers higher compression with reduced file size. Now sure if it's related but maybe a mod can chime in?
I saved the original image (that I uploaded) as a jpeg, progressive encoding with EXIF info, 20% compression, with and without embedded ICC profile (no difference in the result with or without ICC).
Yes, I think that all the recent image problems (uploading and contrast/color) are related to the forum's conversion to AVIF.
I just tried uploading the image that I saved as "standard encoding", without EXIF. That image failed to upload.
Here it is (uploaded with no problems) with "lossless encoding" (still has the contrast and color reduced) :
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am i doing the testing all wrong?
https://us.v-cdn.net/6027503/uploads/editor/dn/4iljj8zu2pir.jpg
The upper images are the best (matches the original).
The lower images are degraded.
Does it look that way to you ?
hmmmmm
i'm on 1 hr sleep
my eyes hurt
the top two look the same. the bottom two look the same
but all i'm doing is viewing the op pic in firefox instances each in a new tab. screen shot both browsers at same time and just moved things around to fit
i'll stop now
It appears that way to me.
The upper images are the best (matches the original).
The lower images are degraded.
When I open your image in a new tab, the upper images match the original.
But the lower images are degraded compared to the upper images.
This is because the upper images are as I uploaded them.
The lower images are a screen capture of how it appears when posted, NOT in a new tab.
In other words, the images are being compressed in contrast and color when displayed within a forum post.
But opening an image in a new tab displays the image as it was originally uploaded.
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ooops forgot about that part.
but viewing the in the forum thread has them all looking the same too me
the "4" coin is being served to me as a png
I don’t have a right click.
Go to the very first image pair posted at the beginning of this discussion. View the image pair in the post (NOT in a new tab).
Who here thinks the top image in that pair has better contrast and color saturation than the lower image in that pair ?
Now go to the same image pair and view it in a new tab.
Who here sees the image (in the new tab) with better contrast/color in the top part compared to the lower part ?
And one more comparison - compare the first image pair shown in my first post to the same image viewed in a new tab.
Who here sees the top image (in the new tab) with better contrast/color compared to the top image in the post (not viewed in a new tab) ?
op pic. top good. bottom bad
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It appears that there is a one-time degredation in an image when displayed within a forum post.
Subsequent screen-capturing and re-posting of that degraded image does not degrade it any further.
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new tab vs. op pic. same look
new browser instance - op pic in browser instance 1 vs op pic in browser instance 2 - same
tae op image is served to me as jpg
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What about
OP picture viewed in forum post, in browser instance 1
compared to
OP picture viewed in NEW TAB, in browser instance 2
?
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Ok, well, a mystery solved, but now a new one.
I am using Firefox as my browser. When I look at the image in my original post at the top of this thread, within my forum post, and I resize the browser window wider and narrower, at some point the contrast/color of the image changes. When I resize the browser window narrower, or increase the display zoom factor, the image suddenly degrades in appearance compared to when the window was wider and/or the zoom factor lower. With a large nearly-full-screen window and a zoom factor of 100% or less, the image posted appears the same as the original.
Adjusting the HEIGHT of the browser window makes no difference.
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browser 1 forum tab views op || browser 1 op in new tab || browser 2 forum tab views op || browser 4 op in new tab
4 views and all are the same