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03/12/2006 04:10:18 PM · #1 |
What is the reccomended amount of USM (Unsharp Mask) for full-sized Raw images from the 300D?
Message edited by author 2006-03-12 16:13:26.
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03/12/2006 04:14:14 PM · #2 |
If the lens is razor sharp, and no sharpening was applied by the RAW converter, then Canon's recommendation:
Amt = 300
Radius = 0.3
Threshold = 0
is close to optimum. I strongly recommend setting the threshold to 2 or 3, however, to avoid "sharpening noise." You really don't need to sharpen edges that have luminosity differences of 3 or less anyhow.
With defalut sharpening applied by ACR, back off on the above to 150-200 for amount.
If the lens is less than razor sharp at the setting used, then sharpening becomes a matter of taste. Usually, the radius needs to be increased to 0.5 or so to have any noticable effect at all. The larger the radius, the lower the required amount to get about the same perceptual sharpening. Larger radius also tends to increase the amount of "USM halo" you get. Try two passes, fade the first to "lighten" blend mode and the second to "darken." This will offset the halo effect.
Message edited by author 2006-03-12 16:18:25.
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03/12/2006 04:15:01 PM · #3 |
I'm not sure about the 300d, but what I usually do for mine is:
1. ~15-20%, 40-60px radius, 1-5 threshold (increases contrast over a bigger area.. may/may not be neccesary, but I like it a lot of the time.
2. 80-120%, 1.2-2.2px radius, 0-2 threshold (actually sharpens).
Might not be the best way to do it, but that's what I do.
EDIT:
Kirbic's method is most likely a lot better than the above, use at your own risk ;p
I do like the lighten/darken mode combo of layers, it lets you have more control over it too
Message edited by author 2006-03-12 16:23:17. |
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03/12/2006 04:25:19 PM · #4 |
| Exclusive of local area sharpening, I have worked on the logic of using 10% of the pixels on the long axis of the exposure for the total sharpening amount, but I like to do the sharpening in stages, so an initial amount of 60-120 for the TIFF, and a second sharpening for the file at the final size, once you have adjusted it for print or web. |
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03/12/2006 04:36:22 PM · #5 |
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