Search found 188 matches

by henrywho
2012-10-09T07:32:27-07:00
Forum: Digital Image Processing
Topic: Enlarge with sRGB, RGB, LAB, LUV, XYZ, sigmoidal,... gamma?
Replies: 113
Views: 205376

Re: Enlarge with sRGB, RGB, LAB, LUV, XYZ, sigmoidal...?

The command does give me a PNG with those crops. It's just weird seeing moire in the "crops" while there are not in the full version.
by henrywho
2012-10-09T01:19:47-07:00
Forum: Digital Image Processing
Topic: Enlarge with sRGB, RGB, LAB, LUV, XYZ, sigmoidal,... gamma?
Replies: 113
Views: 205376

Re: Enlarge with sRGB, RGB, LAB, LUV, XYZ, sigmoidal...?

@Henry: I agree that -unsharp 0x0.75+0.75+0.008 (before -colorspace sRGB, as you indicate) improves on EWA QuadraticJinc. (This is "USM_b".) I find "USM_a" over the top. I wanna create a sample output but the labels and crops seem not matching. Is the syntax correct? set DOUSM=-unsharp 0x0.75+0.75+...
by henrywho
2012-10-08T17:08:46-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 383182

Re: best downsampling method for DSLR photographs

As USM is also pushing values to the extreme, will it benefit from HDRI too?
by henrywho
2012-10-08T10:17:00-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 383182

Re: best downsampling method for DSLR photographs

This test case demonstrates another "feature" of USM: It enhances the "3D" look of the grass. EWA/Catrom and EWA/Lagrange can also simulate this effect. EWA/LanczosN/blur=0.8 cannot.
I should say .... a higher contrast on the grass area.
by henrywho
2012-10-08T08:49:43-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 383182

Re: best downsampling method for DSLR photographs

BTW, I think USM should be done under Linear RGB otherwise it will greatly affect the overall brightness of some feature patterns From a "theoretical viewpoint", I agree. I've compared [1] rgb -> resize -> usm -> srgb [2] rgb -> resize -> srgb -> usm [3] resize -> usm [1] looks most "correct" for b...
by henrywho
2012-10-08T04:30:29-07:00
Forum: Digital Image Processing
Topic: Enlarge with sRGB, RGB, LAB, LUV, XYZ, sigmoidal,... gamma?
Replies: 113
Views: 205376

Re: Enlarge with sRGB, RGB, LAB, LUV, XYZ, sigmoidal...?

NicolasRobidoux wrote:@Fred and Henry:
To illustrate the recommendations RE: USM I've had in "The Recommendations" for a while now, I've added EWA Lanczos with blur=0.8 to the "Extra" examples above.
Does "Extra" refer to some additional parameters?
by henrywho
2012-10-08T04:29:30-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 383182

Re: best downsampling method for DSLR photographs

Another test case (a dog photo taken using IPhone5): http://www.dcfever.com/phones/viewsamples.php?set=780&picture=7632 convert dog_ip5.jpg -set colorspace srgb -colorspace rgb -define filter:filter=Jinc -define filter:window=Jinc -define filter:lobes=2 -define filter:blur=0.8 -distort resize 1021x7...
by henrywho
2012-10-08T04:12:21-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 383182

Re: best downsampling method for DSLR photographs

...I have always been advocating the direct use of EWA-Lagrange or even EWA-Catrom down-sampling instead of downsampling-then-USM. 8) Have you experimented with various numbers of EWA-Lagrange lobes, and compared with using unwindowed (meaning Box) Jinc and Sinc, the latter orthogonally or radially...
by henrywho
2012-10-07T19:20:05-07:00
Forum: Users
Topic: [Compile] lcms(1) and libxml2 in ImageMagick
Replies: 0
Views: 3446

[Compile] lcms(1) and libxml2 in ImageMagick

I have two questions compiling ImagMagick 6. [1] I have both lcms1 and lcms2 compiled and installed under MinGW x64. ImageMagick's configure found both but ended up using lcms2 only (-llcms2 but no -llcms). Is it how the config is meant to be? [2] What is the use of libxml2? ImageMagick seems to be ...
by henrywho
2012-10-06T18:58:54-07:00
Forum: Bugs
Topic: [Solved] "no decode delegate for this image format" for MIFF
Replies: 1
Views: 4518

Re: "no decode delegate for this image format" for MIFF

Um.. both commands below are working..... Seems I made some typo previously. convert -size 10x6 xc:grey20 +antialias -draw "fill white line 4,0 5,5" a.miff convert a.miff a.png convert -size 10x6 xc:grey20 +antialias -draw "fill white line 4,0 5,5" -colorspace RGB +sigmoidal-contrast 7 ^ ^( -clone 0...
by henrywho
2012-10-06T18:34:43-07:00
Forum: Bugs
Topic: [Solved] "no decode delegate for this image format" for MIFF
Replies: 1
Views: 4518

[Solved] "no decode delegate for this image format" for MIFF

Tried ImageMagick-6.7.9-10-Q16-windows-x64-static.exe with Nic's command at http://www.wizards-toolkit.org/discours ... =1&t=21992

It says, montage.exe: no decode delegate for this image format `C:/DOCUME~1/ADMINI~1/LOCALS~1/Temp/magick-3XulB4S8' @ error/constitute.c/ReadImage/550.
by henrywho
2012-10-05T01:50:40-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 383182

Re: best downsampling method for DSLR photographs

btw, would you mind adding a few line explaining "interpolatory" and "non-interpolatory" methods?
by henrywho
2012-10-04T23:42:12-07:00
Forum: Users
Topic: [SOLVED] Why "EWA Quadratic" becomes "EWA Quddratic"?
Replies: 22
Views: 23872

Re: Why does "EWA Quadratic" become "EWA Quddratic" in capti

Windows non-HDRI ... no problem
HDRI neither
by henrywho
2012-10-04T05:57:50-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 383182

Re: best downsampling method for DSLR photographs

And I suggest giving LanczosRadius3 another name when it is made a built-in filter..... coz it is actually sharper than LanczosSharp. :lol: