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09/22/2012 06:29:39 PM · #26 |
I take a different approach... I do agree that resizing on an even ratio can (slightly) improve preservation of detail, however the important resizing step is the last one. So, resize first to 1600px, then resize again to 800. You can tweak the interpolation algorithms to optimize, for instance it's often better not to use "bicubic sharper" on the 1600px resize, but to use it for the final resize. Different images need different treatment.
I almost never find that my 800px images will fail to save to less than 300KB without visible degradation. Only when an image is just loaded with fine detail over most of the area of the photo does that become a problem.
ETA:
For example, the image below contains a lot of very fine detail, was submitted at 800x800 and weighs in at a svelte 244KB.
Message edited by author 2012-09-22 18:37:34. |
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09/22/2012 06:57:45 PM · #27 |
Originally posted by GeneralE:
Originally posted by PuppyDogMom:
File size is 152KB, pixel size is 800x519, jpg. That shouldn't be a problem, should it?
It uploaded to my portfolio. |
Try putting it in your Workshop folder, and then use the "Copy From Workshop" option on the submission page. |
This worked. Learned a lot from this. Thanks helpers. |
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09/22/2012 07:00:21 PM · #28 |
Originally posted by kirbic:
ETA:
For example, the image below contains a lot of very fine detail, was submitted at 800x800 and weighs in at a svelte 244KB.
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I bet with a calico cat it would be closer to 444KB ... you save a LOT of filesize using JPEG by limiting the color palette. |
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09/22/2012 07:30:53 PM · #29 |
Originally posted by GeneralE:
Originally posted by kirbic:
ETA:
For example, the image below contains a lot of very fine detail, was submitted at 800x800 and weighs in at a svelte 244KB.
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I bet with a calico cat it would be closer to 444KB ... you save a LOT of filesize using JPEG by limiting the color palette. |
Not really. Look at all three channels, they all have a lot of detail. In fact, I never thought about it before, but an RGB image that has only shades of gray can actually have more data than an image that is saturated in one color... because the light-dark transitions are present in all three channels, by definition. |
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