Search found 188 matches

by henrywho
2012-11-16T20:34:10-07:00
Forum: Digital Image Processing
Topic: "Sigmoidal" minimization of resampling filter haloing & blur
Replies: 136
Views: 260445

Re: "Sigmoidal" minimization of resampling filter haloing &

But I think that we are at the point where the sensors are more "accurate" than the lenses, which means that at the pixel level, there is lens blur -> subcritical image. It's hard to judge because lenses have varied quality (http://www.lenstip.com/). We dunno whether we are having the sharpest lens...
by henrywho
2012-11-16T11:31:31-07:00
Forum: Digital Image Processing
Topic: "Sigmoidal" minimization of resampling filter haloing & blur
Replies: 136
Views: 260445

Re: "Sigmoidal" minimization of resampling filter haloing &

This being said, high contrast works well when the image is "sub-critical", meaning that the content stays clear of Nyquist. And I have the impression that what comes out of top of the line high megapixel DSLRs fits this description. What about Sigma DP1/DP2 Merrill? No bayer pattern. Breathtaking ...
by henrywho
2012-10-25T06:57:37-07:00
Forum: Digital Image Processing
Topic: Convert JPEG from progressive to baseline losslessly
Replies: 14
Views: 43967

Re: Convert JPEG from progressive to baseline losslessly

Use jpegtran. I remember that it can do so in a lossless way.
by henrywho
2012-10-21T18:30:19-07:00
Forum: Users
Topic: [Share] Compile IM6 with FFTW+HDRI using mingw64
Replies: 4
Views: 8135

Re: [Share] Compile IM6 with FFTW+HDRI using mingw64

This would make a nice addition if a copy was place at http://www.imagemagick.org/discourse-server/viewtopic.php?f=4&t=14251 I will do so after some fine-tuning. My compile is HDRI enabled already and it has FFTW statically linked in. Actually, I want to build a shared-library compile of ImageMagic...
by henrywho
2012-10-21T17:26:46-07:00
Forum: Users
Topic: [Share] Compile IM6 with FFTW+HDRI using mingw64
Replies: 4
Views: 8135

Re: [Share] Compile IM6 with FFTW+HDRI using mingw64

Should a "-fft -ift" roundtrip be producing a padded square picture? Both command below are producing a padded square picture with my own compile:

convert wizard.png wizard.png -fft -ift -quality 95 w3.png
convert wizard.png wizard.png +fft +ift -quality 95 w4.png
by henrywho
2012-10-21T10:07:46-07:00
Forum: Users
Topic: [Share] Compile IM6 with FFTW+HDRI using mingw64
Replies: 4
Views: 8135

[Share] Compile IM6 with FFTW+HDRI using mingw64

A) Download the following: Minimalist GNU for Windows (http://sourceforge.net/projects/mingw/files/Installer/mingw-get-inst/) MinGW-builds (http://sourceforge.net/projects/mingwbuilds/files/host-windows/releases/4.7.2/64-bit/threads-win32/sjlj/) zlib-1.2.7.tar.gz bzip2-1.0.6.tar.gz xz-5.0.4.tar.gz f...
by henrywho
2012-10-18T16:39:54-07:00
Forum: Digital Image Processing
Topic: sigmoidized EWA quadratic B-spline windowed Jinc 3-lobe
Replies: 19
Views: 39535

Re: sigmoidized EWA quadratic B-spline windowed Jinc 3-lobe

This being said, EWA Spline-windowed Jinc Radius 3 is an expensive way of getting a scheme which is very close to EWA Robidoux. (Noticeably better when downsampling? It's a little sharper and hopefully has "moire fighting" whiskers.) Yes, definitely better "moire fighting".... if you are talking ab...
by henrywho
2012-10-13T19:16:49-07:00
Forum: Users
Topic: Question on Convert + Montage
Replies: 5
Views: 7723

Re: Question on Convert + Montage

Yeah! "-respect-parenthesis" does the magic!

But why doesn't NicolasRobidoux need this parameter when he produces his samples?
by henrywho
2012-10-13T10:48:13-07:00
Forum: Users
Topic: Question on Convert + Montage
Replies: 5
Views: 7723

Re: Question on Convert + Montage

In unix syntax (cygwin or msys): export DOUSM="-unsharp 0x0.75+0.75+0.008" export RESIZE="83x61! -alpha off +repage" ./convert wizard.png -set colorspace sRGB -colorspace RGB \ \( -clone 0 -filter Point -resize ${RESIZE} -set caption "Point" \) \ \( -clone 0 -filter Point -resize ${RESIZE} -set capt...
by henrywho
2012-10-13T08:45:57-07:00
Forum: Bugs
Topic: convert -sepia-tone different on win vs. linux
Replies: 9
Views: 15104

Re: convert -sepia-tone different on win vs. linux

what about

convert c.jpg -set colorspace sRGB -sepia-tone 80% 1.jpg
convert c.jpg -set colorspace sRGB -sepia-tone 80% 2.jpg
by henrywho
2012-10-12T23:21:29-07:00
Forum: Users
Topic: Question on Convert + Montage
Replies: 5
Views: 7723

Re: Question on Convert + Montage

The result is the same if I use "temp.mpc" instead of "temp.miff".
by henrywho
2012-10-12T21:31:00-07:00
Forum: Users
Topic: Question on Convert + Montage
Replies: 5
Views: 7723

Question on Convert + Montage

I tried to create a thumbnail image: set DOUSM=-unsharp 0x0.75+0.75+0.008 set RESIZE=83x61! -alpha off +repage convert wizard: -set colorspace sRGB -colorspace RGB ^ ^( -clone 0 -filter Point -resize %RESIZE% -set caption "Point" ^) ^ ^( -clone 0 -filter Point -resize %RESIZE% -set caption "Point" ^...
by henrywho
2012-10-10T03:47:36-07:00
Forum: Users
Topic: Help setting up imagick & ghostscript (will pay for help!)
Replies: 1
Views: 3900

Re: Help setting up imagick & ghostscript (will pay for help

Why don't you use ghostscript to convert the pdf to jpeg?
by henrywho
2012-10-09T18:38:37-07:00
Forum: Users
Topic: [SOLVED] Why "EWA Quadratic" becomes "EWA Quddratic"?
Replies: 22
Views: 23904

Re: [SOLVED] Why "EWA Quadratic" becomes "EWA Quddratic"?

Similar stuff for me.... I am now struggling with GCC 4.7.2 Mingw64's link-time-optimization (-flto) .... It gives weird linking error (it said a BZ2 decompression routine was declared as a variable but then re-defined as a function). No such error before I added -flto....