Legacy ImageMagick Discussions Archive

We are looking at using ImageMagic to convert multiple page PDF's to PNG colour type 3 images. First question:

The syntax I used to create the type3 PNG's was:
convert inputFile -type Palette outputFile

Will that give me a PGN with colour type 3? Or is there a way to verify that?

Second question:
How does ImageMagic scale from a performance perspective? Is there any data as far as conversions/min of any type out there for ImageMagick?

Thanks!

You can check the PNG color type with

• identify -debug coder -log %e file.png

and look for a line saying "PNG color_type N"

The performance of writing PNG files is mostly governed by the
time used in the "deflate" compression which is proportional to
the number of pixels in the image.

Thanks,

Now I thought that I was using the right syntax to create a PNG with color type 3 but it turns out I wasn't. I have tried:

convert image.pdf -type Palette outimage.png

and

convert image.pdf -channel Index outimage.png

Any thoughts?

Thanks!
Matt

mtdimich wrote: Thanks,

Now I thought that I was using the right syntax to create a PNG with color type 3 but it turns out I wasn't. I have tried:

convert image.pdf -type Palette outimage.png

and

convert image.pdf -channel Index outimage.png

Any thoughts?

Thanks!
Matt

• -colors 255