Legacy ImageMagick Discussions Archive

I want to export PSD layers to PNG, maintaining the layers' layout (i.e. keeping transparent areas in each one so that stacking them back still produces the original illustration), but still trimming out areas that would be transparent in their composite version including layers which are hidden in ...

Any progress on pixel art scaling algorithms?

Is there a way to reproduce Photoshop's "Darker color" blending mode using the command line?

Just to answer to myself: apparently the options are to keep all metadata of the input image or none of it (adding the option -strip; unless one wants to rely on an extra tool like exiftool to be able to target metadata more granularly), in which case Photoshop will read the ppi resolution that conv...

Well, here it is: # Change paths and value MY_INPUT="/path/to/inputImage.tif" MY_OUTPUT="/path/to/outputImage.jpg" MY_PX_LIMIT=2000000 # Go! IMG_RES=( $(identify -units PixelsPerInch \ -format "%w %h %x %y" \ "$MY_INPUT" ) ) IMG_X_DENSITY=$(echo "${IMG_RE...

Yes, I know I can calculate it myself and feed it with exiftool (`convert -density` is out of the question as it is not a lossless operation).

That adds complexity. I was wishing for a `convert` one liner that both resizes to a Pixel Count Limit AND writes the new ppi metadata.

The examples page on Resize or Scaling (General Techniques) states one can -resize an image to a certain Pixel Count Limit : convert dragon.gif -resize 4096@ pixel_dragon.gif My problem with -resize is that it will keep the ppi of the output unchanged, resulting in the output image and the input ima...

I see. It was on 6.8.6-3 (it is the current version available at Homebrew for Mac OS X)

The following command: convert input.jpg -resize 2000000@ output.jpg with input.jpg being 2630×1513, the command above produces output.jpg at 1865×1073, which totals 2001145px, hence this is a bug, as the pixel count of the resulting image should "contain no more than the given number of pixels...

I am trying to convert a multipage PDF containing both CMYK & RGB elements to one RGB JPEG per page. The following command will do so, but the output JPEGs will be CMYK. convert input.pdf output%d.jpg The following will produce RGB JPEGs, but the color conversion will not be accurate (oversatura...

Is there any way to give -density a formula instead of a fixed value? I am trying to convert a PDF to JPEG by rendering with at 2x the intended output density, downsampling to get antialiased lines, and finally assigning the output JPG proper density (ppi) metadata so that its physical size in inche...