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DPChallenge Forums >> Current Challenge >> Submitted image sizes all over the place lately?
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06/23/2010 05:19:28 PM · #1
I'm not sure if this has become more prevalent lately, or if by some chance it's always been this way, and I'm just noticing it lately... Does anyone else notice that submitted image sizes seem to be all over the map lately?

For the exclusive challenges open now, for example -- the rules allow for a minimum of 160 pixels short-edge and maximum of 800 pixels long edge. I haven't seen any that approach the 160 minimum dimension, but that 800 pixel maximum seems to be something of a moving target. Just eyeballing some of the "different" sizes I noticed in this recent batch of submissions, I found long-edge measurements including:

800, 740, 720, 690, 650, 640, 600, 580, all the way down to 370.

Now, again, I know the rule is a *maximum*, so clearly all of these are perfectly legal entries, I'm not disputing that in the slightest... but I guess I'm just wondering *why*? If given 800-pixel longest edge maximum entry dimension, why not use the full amount of "allowed" pixels in your submission?

I'm not trying to call anyone specific out, or say it's "bad," or disparage anyone's choice of upload size... but I'm just really curious *why not* use the full available size?
06/23/2010 05:24:16 PM · #2
I haven't really paid attention to that....You are absolutely right. When I size a shot I always make the longest edge 800px and then my short side is whatever.
06/23/2010 05:28:25 PM · #3
I will usually submit portrait orientations in somewhere around the 750 pixel mark. Occasionally I will use less than the 800 pixel width for landscapes if I can't get the compression down to a reasonable level.
06/23/2010 06:22:02 PM · #4
For photos with any significant detail, or those in portrait orientation, I resample to exactly 25% of the original size, which for my Canon takes it to 704 pixels; for landscapes with little detail (e.g. lots of clouds) or images with a limited color palette (e.g. grayscale) I'll sometimes use the full 800 pixels.

Partly this is to reduce the file size without increasing the amount of JPEG compression, and partly out of an intuitive belief that sampling exactly four pixels to generate every pixel in the final file will yield a more accurate result more quickly than if the software is basing the calculation on 3.8472 pixels (or whatever it would come out to). Often, if the processed, resized and sharpened image is under 320KB or so, I will sometimes crop away a few "unimportant" pixels around the edges to get the file size down, rather than increasing the degree of compression, so long as it soesn't significantly alter the composition.

I have a smaller monitor -- I prefer to see all of the tall images without (or with minimal) scrolling.
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