Legacy ImageMagick Discussions Archive

Follow-up question: I know there was discussion elsewhere about ImageMagick's lack of support for chroma sub-sampling when JPEG compression is used in a TIFF files unless the colorspace is ycbcr. The latest I read was that it was due to a libtiff limitation. However, there are other programs such as ...

Thanks, that makes sense

I have an uncompressed TIFF source image that I'm converting to pyramidal tiff files with JPEG compression. I would like to take advantage of the significant space savings (3x) afforded by chrominance subsampling as as John Cupitt, the author of vips, points out here: https://github.com/jcupitt ...

the tile geometry in use can also be discovered using the tiffinfo command

I was able to verify using IIP Image server that the tile-geometry parameter is being honored. The fact that additional pages are being created is probably not a big deal since the resolution is so low. It would still be nice to know of a way to report on the tile geometry of a pyramidal tiff though ...

Installed ImageMagick-7.0.7-2.x86_64.rpm and ImageMagick-libs-7.0.7-2.x86_64.rpm into RHEL7 magick -size 1024x1024 canvas:khaki canvas.jpg magick canvas.jpg -define tiff:tile-geometry=256x256 ptif:canvas.tif identify canvas.tif produces canvas.tif[0] TIFF 1024x1024 1024x1024+0+0 8-bit sRGB 4.314MiB ...