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Old 30 May 2005, 12:27 AM   #1
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Question Unsharp mask lines

The 33k atached file shows the problem I have with USM
(Unsharp Mask Filter for VirtualDub. Developed by Donald Graft, optimized by Antonio Foranna. Version 1.4)
in vdub 1.4d. I am editing a 704 x 576 pal capture on a leadtek card using leadtek's Winfast PVR. This example was captured uncompressed and in VDub I cropped x2 and y2 by 4, did a level adjust and have USM set at diam 5, str-1, thr 2, clip 0000 and inter "no".
These lines are apparent in the preview and the finished file. The phenomenon appeared after I did a M-board, capture card and Win 98 to XP upgrade. Sometimes it goes away if I put the Sharpen filter on before USM.

Any ideas will be gratefully received.
Attached Thumbnails
Unsharp mask lines-usmadob.jpg  
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Old 31 May 2005, 08:10 PM   #2
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did you ever try multiples of 8 when cropping?
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Old 1 Jun 2005, 10:12 AM   #3
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No, would 4 each side be as good? I had only cropped where there were black lines and thought that I would be OK with asymetrical crops and that increments of 4 would be OK. The divx guides gave me the impression that multiples of 4 in width and 2 in height would be fine (I never knew what valid depths meant?).

Thanks for your help.

Later-Tried using 3.11, cropped up to 8 off all round for an image of 688x560 which is multiples of 16. Still get the lines but the angle and pitch varies with crop size variation. Un-cropped has none.

Next day-Tried to paste a new usm 1.4 into v-dub plug ins directory, didn't help, did the same with usm 1.3 and the problem seems to have gone away.

Last edited by Easier Way?; 2 Jun 2005 at 07:40 AM
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