image warping, morphing, rectification
image alignment
image projection (on any 3D shape)
HDR imaging/tone mapping
Digital matting
color management
Tuesday, April 22, 2008
[Photo] great photoshop sites
PhotoshopCAFE
http://www.photoshopcafe.com/index.htm
HDR - High Dynamic Range Photography.
Merging HDR in Photoshop CS3 Tutorial
http://www.photoshopcafe.com/index.htm
HDR - High Dynamic Range Photography.
Merging HDR in Photoshop CS3 Tutorial
Wednesday, April 9, 2008
[Photo] crop image with specific aspect ratio in Photoshop
fill in the aspect ratio in the control boxes and leave the resolution box empty
Tuesday, April 8, 2008
[Photo] GREYCstoration
* dt -- strength of the smoothing factor (default: 50)
* p -- contour preservation (default: 0.8)
* a -- smoothing anisotropy (default: 0.8)
* alpha -- noise scale (default: 0.5)
* sigma -- geometry regularity (default: 1)
* iter -- number of iterations (default: 1)
greycstoration -restore before.jpg -dt 280 -p .7 -a .9 -sigma 2 -alpha .9
greycstoration -restore moule_original.png -a 0.1 -dt 100 -iter 2 -o moule_tuned.png
from http://jcornuz.wordpress.com/2008/01/04/denoising-with-greycstoration/
Command line for 16bits
From there, I decided to take my parameters into the command line version, which supports 16bits treatment. The equivalence between the plug-in and the command line version are straightforward:
strength :: -dt
contour preservation :: -p
anisotropy :: -a
noise scale :: -alpha
geometry regularity :: - sigma
spacial step :: -dl
angular step :: -da
approximation :: -fast
iterations :: -iter
interpolation algorithm :: -interp
so my command was:
greycstoration -restore ufraw_0.tif -bits 16 -o test.tif -dt 60 -p 0.7 -a 0.3 -alpha 5 -sigma 2.3 -dl 0.8 -da 30 -fast true -iter 1 -interp 2 -sdt 0
the -sdt 0 bit was to ask GREYCstoration not to do any sharpening on my image.
The processing to approximately for ever and a day to complete. GREYCstoration opens a windows with your image in it and when the processing is done, click on the window and press “S” for save. Check that the result image (test.tif in this case) is saved and then “Q” will quit. The result is the same image than in The Gimp but in 16bits precision.
What about luminance noise?
Call me crazy (if not already done) but I much rather like some luminance noise left than a water-colored image. In talking to the maintainer about my taste for luminance noise, he added an option to differentiate treatment on chroma vs luma noise. You can do that by using the -cbase 1 (0=RGB, 1=YCrCb) -crange 1,2 (0 is luma noise which we want to preserve). By the way, this options is currently only working in the command line version. The result is good, although it is possible to do better:
* p -- contour preservation (default: 0.8)
* a -- smoothing anisotropy (default: 0.8)
* alpha -- noise scale (default: 0.5)
* sigma -- geometry regularity (default: 1)
* iter -- number of iterations (default: 1)
greycstoration -restore before.jpg -dt 280 -p .7 -a .9 -sigma 2 -alpha .9
greycstoration -restore moule_original.png -a 0.1 -dt 100 -iter 2 -o moule_tuned.png
from http://jcornuz.wordpress.com/2008/01/04/denoising-with-greycstoration/
Command line for 16bits
From there, I decided to take my parameters into the command line version, which supports 16bits treatment. The equivalence between the plug-in and the command line version are straightforward:
strength :: -dt
contour preservation :: -p
anisotropy :: -a
noise scale :: -alpha
geometry regularity :: - sigma
spacial step :: -dl
angular step :: -da
approximation :: -fast
iterations :: -iter
interpolation algorithm :: -interp
so my command was:
greycstoration -restore ufraw_0.tif -bits 16 -o test.tif -dt 60 -p 0.7 -a 0.3 -alpha 5 -sigma 2.3 -dl 0.8 -da 30 -fast true -iter 1 -interp 2 -sdt 0
the -sdt 0 bit was to ask GREYCstoration not to do any sharpening on my image.
The processing to approximately for ever and a day to complete. GREYCstoration opens a windows with your image in it and when the processing is done, click on the window and press “S” for save. Check that the result image (test.tif in this case) is saved and then “Q” will quit. The result is the same image than in The Gimp but in 16bits precision.
What about luminance noise?
Call me crazy (if not already done) but I much rather like some luminance noise left than a water-colored image. In talking to the maintainer about my taste for luminance noise, he added an option to differentiate treatment on chroma vs luma noise. You can do that by using the -cbase 1 (0=RGB, 1=YCrCb) -crange 1,2 (0 is luma noise which we want to preserve). By the way, this options is currently only working in the command line version. The result is good, although it is possible to do better:
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