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Thread started 27 May 2017 (Saturday) 15:16
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Why is Flickr Posterizing my images?

 
calypsob
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May 27, 2017 15:16 |  #1

I just got done uploading an image and was disappointed to see yet again that flickr is posterizing my data. Why does this happen? Is there a way to avoid this ? Is see it mostly in the shadows to the right of the center down in the mountain area.

IMAGE: https://c1.staticflickr.com/5/4199/34930866035_c7e83ff776_c.jpg
IMAGE LINK: https://flic.kr/p/VdHP​uX  (external link) Killer Sunset from the Blue Ridge Parkway (external link) by Wes Schwarz (external link), on Flickr

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john ­ crossley
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May 27, 2017 15:36 |  #2

calypsob wrote in post #18364363 (external link)
I just got done uploading an image and was disappointed to see yet again that flickr is posterizing my data. Why does this happen? Is there a way to avoid this ? Is see it mostly in the shadows to the right of the center down in the mountain area.


QUOTED IMAGE
IMAGE LINK: https://flic.kr/p/VdHP​uX  (external link) Killer Sunset from the Blue Ridge Parkway (external link) by Wes Schwarz (external link), on Flickr

Can you show us the image before you uploaded it to Flickr so that we have something to compare it to.


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calypsob
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May 27, 2017 18:07 as a reply to  @ john crossley's post |  #3

https://drive.google.c​om …h479N_kZr6dTkzZ​lhwdUJwLTg (external link) here is a psd


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Damo77
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May 27, 2017 20:15 |  #4

I think John wanted the actual file you uploaded to Flickr.

(You didn't upload that massive PSD, did you?? That might explain a great deal, if you did.)


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Post edited over 1 year ago by Peano. (4 edits in all)
     
May 28, 2017 09:10 |  #5

I downloaded your linked image and opened it in Photoshop so I could zoom in, and I really am not seeing any posterization. Your image is a bit out of focus, but I don't see any stepwise gradients like this. [EDIT: Also downloaded your PSD file and compared it with the Flickr image; the only difference I see is that the Flickr image isn't quite as sharp -- and it's downsized, of course. As a side note, it might be a good idea to use sRGB instead of Adobe RGB when uploading for web viewing.]


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davesrose
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May 28, 2017 10:06 |  #6

It could be that you're seeing differences in color between the web and Photoshop. The short answer is to convert and preview your image in sRGB colorspace while in Photoshop. The long answer is that web browsers are starting to accept ICC color profiles, and are starting to accept other colorspaces. Flickr may only accept sRGB still.

web browser color management guide (external link)


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May 28, 2017 22:37 as a reply to  @ Damo77's post |  #7

no I uploaded a jpeg, I dont think flickr would produce and image with a psd


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calypsob
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May 28, 2017 22:38 as a reply to  @ Peano's post |  #8

I see some large chunky things going on in the shadows mid center to the mountains. Maybe it is simply a jpeg artifact.


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calypsob
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May 28, 2017 22:39 as a reply to  @ davesrose's post |  #9

I always save jpeg to srgb.


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May 28, 2017 23:10 |  #10

calypsob wrote in post #18365329 (external link)
no I uploaded a jpeg

Ok, great! Then may we see that?


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davesrose
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May 29, 2017 10:05 |  #11

calypsob wrote in post #18365331 (external link)
I always save jpeg to srgb.

Are you sure you proof in sRGB?


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Peano
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May 29, 2017 11:08 |  #12

calypsob wrote in post #18365330 (external link)
I see some large chunky things going on in the shadows mid center to the mountains. Maybe it is simply a jpeg artifact.

Yes, I think you're seeing jpeg artifacts (blocking) in the shadows. That's pretty common in shots like this. Here's a section zoomed at 1600 percent with contrast exaggerated to bring out the artifacts.


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Why is Flickr Posterizing my images?
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