Legacy ImageMagick Discussions Archive

convert lab250.tif -colorspace RGB -distort resize 200x200 -alpha off +repage -colorspace sRGB sRGB.png

If 'RobidouxSharp' appears in the above image, then the examples have updated It seems the RobidouxSharp filter is not available in 6.7.6-7 (win32 dynamic). Version: ImageMagick 6.7.6-7 2012-04-20 Q16 http://www.imagemagick.org Copyright: Copyright (C) 1999-2012 ImageMagick Studio LLC Features: Ope...

Try these too: for %F in (Lagrange Catrom Gaussian RobidouxSharp LanczosSharp Lanczos2Sharp Robidoux) do ( convert.exe lena.bmp -colorspace RGB -filter %~F -distort resize 190x190! -alpha off +repage -colorspace sRGB -quality 95 "lena_%~F.png" ) if Catrom and the default Lagrange are not s...

Any sample?
What is the command line used?

(Is this topic more appropriate for the "Users" forum?)

NicolasRobidoux wrote:(we can't live with jpeg compression)

But you cannot avoid JPEG compression in the real world. As the JPEG engines of digital cameras (dSLR, NEX, m43, compacts or even mobiles) improve, fewer and fewer peoples want to bother with RAW files.

The compound eyes of http://upload.wikimedia.org/wikipedia/commons/8/85/Calliphora_sp_Portrait.jpg seems really a tough case. Down-sampling it to 480x720 and under different algorithms there may be: a) moire patterns on the compound eyes b) increase in overall brightness (probably due to haloing) c)...

NicolasRobidoux wrote:Haloing is less of an issue when downsampling.

Can we have/do we need separate default filters for upsampling and downsampling?

Fred: Many many thanks! http://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=20751#p83509 definitely has the potential to mess up my student Adam Turcotte's thesis, and we use bleeding edge. Please also make sure that all his test images are c o l o r e d . http://www.imagemagick.org...

My 99% use cases are to down-size the overly-MegaPixel-bloated JPG (and recently RAW) from my digital cameras to desktop, FB and web sizes, i.e. from ~16MP down to ~1MP, using distort resize under linear RGB. I want to balance between aliasing and sharpness (but less concern on haloing because I hav...

Does it mean...... JincJinc2: -define filter:filter=Jinc -define filter:window=Jinc -define filter:blur=0.9580278036312191 -define filter:lobes=2 -distort resize .... JincJinc3: -define filter:filter=Jinc -define filter:window=Jinc -define filter:blur=0.9891028367558475 -define filter:lobes=3 -disto...

Indeed, we have at least four combinations:

1) Linear Gray
2) S-Gray
3) Gray-only color image in Linear RGB
4) Gray-only color image in sRGB

Imagemagick will auto-magically convert (3)/(4) to (1)/(2), for some rationale I don't really understand.

Is it an error of the make file or the package script?

convert.exe rings_lg_orig.png -colorspace RGB -distort resize 16% -colorspace sRGB -quality 95% t01.jpg convert.exe rings_lg_orig.png -colorspace RGB -distort resize 16% t02.mpc convert.exe t02.mpc -colorspace sRGB -quality 95% t02.jpg convert.exe rings_lg_orig.png -colorspace RGB -distort resize 1...

I am just trying to do a colorspace-aware resize. In 6.7.6-3, "convert.exe rose: -colorspace RGB -resize 90% -colorspace sRGB t_02.png" works as intended. But there were bugs with gray-colored image, as discussed in http://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=20658 ...

Okay:- convert.exe rose: -resize 90% t_01.png
Very dark (not yet sRGB?):- convert.exe rose: -colorspace RGB -resize 90% -colorspace sRGB t_02.png
Okay again:- convert.exe rose: -colorspace RGB -resize 90% -set colorspace RGB -colorspace sRGB t_03.png