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Photoshop Contest Forum Index - Contests and Entries - Question regarding sudden apparent decrease of JPEG quality - Reply to topic

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Granulated

Location: London

Post Wed Feb 28, 2007 2:57 pm   Reply with quote         


... for the 550-450 image


Has the jpeg compression ratio been decreased in the past few days?

A few of the clock entries today are really suffering. Scrumpies image is a mere 14KB !!!

I of course realise that jpeg has difficulties with solid areas of read but blimey !




vokaris
Site Moderator

Post Wed Feb 28, 2007 3:25 pm   Reply with quote         


same issue here - seems like the reds are suffering the most

http://photoshopcontest.com/view-entry/115714/too-much-time.html

This is not about the entry per se, but about the serious artifacting in the 550px preview - especially when reencoding solid colors




marcoballistic

Location: I am everywhere, and Nowhere, but mostly, I am right here!

Post Wed Feb 28, 2007 3:31 pm   Reply with quote         


I was thinking that, if people don't click it big, then some entries are just gonna come across chunky, low res messes... which they arn't Confused




Micose

Location: Quebec (CAN) & France

Post Wed Feb 28, 2007 3:54 pm   Reply with quote         


Granulated

Location: London

Post Wed Feb 28, 2007 4:28 pm   Reply with quote         


Micose wrote:



glad im not the only one




Granulated

Location: London

Post Wed Feb 28, 2007 4:31 pm   Reply with quote         


vokaris wrote:
same issue here - seems like the reds are suffering the most

http://photoshopcontest.com/view-entry/115714/too-much-time.html

This is not about the entry per se, but about the serious artifacting in the 550px preview - especially when reencoding solid colors


yep...using the familiar photoshop scale I'd guess that theyre the equivalent of about a 30-35% quality setting.




vokaris
Site Moderator

Post Wed Feb 28, 2007 4:40 pm   Reply with quote         


Another fine example showing the reds suffering from artifacting significantly more than other solid colors - see Dino in lower left corner.
http://photoshopcontest.com/view-entry/108749/yabba-dabba-doo.html

I just couldn't resist to beat my own drum




blade_in_exile

Location: lancashire

Post Wed Feb 28, 2007 4:43 pm   Reply with quote         


vokaris wrote:
Ano

I just couldn't resist to beat my own drum


and most of us didn't know you had a drum Twisted Evil Twisted Evil




_________________
chopper with training wheels

Post Wed Feb 28, 2007 5:07 pm   Reply with quote         


oh, yuck, what's up with that?? It wasn't like that until recently...I'm sad now, because an upcoming entry of mine has lots of red in it, and the actual image is nice and crisp, but now the smaller version that is displayed looks horrible...




_________________
"Recently, NASA scientists discovered that most people love to play video games but hate to die in fiery airplane crashes."

Post Wed Feb 28, 2007 7:11 pm   Reply with quote         


well, my question is why does it compress it anyway (even if the compression ratio was lower)...
People are allready trying hard to keep the filesize limits (especially when you're non-advantage). Huh..




_________________
I used to do stuff around here
vokaris
Site Moderator

Post Wed Feb 28, 2007 7:43 pm   Reply with quote         


Grefix wrote:
well, my question is why does it compress it anyway (even if the compression ratio was lower)...
People are allready trying hard to keep the filesize limits (especially when you're non-advantage). Huh..
This applies to the resized 550px wide 'preview' images on the voting pages, I think the large (click for detail) versions are kept intact as submitted




Post Wed Feb 28, 2007 7:45 pm   Reply with quote         


vokaris wrote:
Grefix wrote:
well, my question is why does it compress it anyway (even if the compression ratio was lower)...
People are allready trying hard to keep the filesize limits (especially when you're non-advantage). Huh..
This applies to the resized 550px wide 'preview' images on the voting pages, I think the large (click for detail) versions are kept intact as submitted


exactly. But it's still a good question, because it never used to look so terrible.




_________________
"Recently, NASA scientists discovered that most people love to play video games but hate to die in fiery airplane crashes."

Post Wed Feb 28, 2007 7:58 pm   Reply with quote         


vokaris wrote:
Grefix wrote:
well, my question is why does it compress it anyway (even if the compression ratio was lower)...
People are allready trying hard to keep the filesize limits (especially when you're non-advantage). Huh..
This applies to the resized 550px wide 'preview' images on the voting pages, I think the large (click for detail) versions are kept intact as submitted

hmm right there, I've mistake the fullsize directory with the large directory.. For a minute there I took them as the same




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I used to do stuff around here
anfa

Location: Geordieland, UK

Post Wed Feb 28, 2007 9:45 pm   Reply with quote         


Naiko said that ages ago!!!




ScionShade

Location: VeniceFlaUS

Post Thu Mar 01, 2007 2:45 am   Reply with quote         


Anybody try submitting their still image as a gif?
No?




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