Legacy ImageMagick Discussions Archive

Hello

I would like to generate a 256x256 .png file in which I can discretely set the colour of each pixel in the image. Is there a way to pass in these tens of thousands of -draw points from the command line, without having to call the command line once for each and every pixel I want to draw? I imagine this would have to involve a text file containing the values to be written, otherwise the shell might reach its character limit or something.

Thanks

See txt: at https://www.imagemagick.org/Usage/files/#txt or sparse-color: at https://www.imagemagick.org/Usage/files/#sparse-color. Create a text file in one of these formats and use that as input to convert.

convert @textfile.txt result.png

Thanks!

It's quite easy to use

input.txt wrote: # ImageMagick pixel enumeration: 2,2,255,rgb
0,0: (255,255,255)
1,0: (0,0,0)
0,1: (0,0,0)
1,1: (255,255,255)

Result:

That is correct.

Hello again

So it turns out I need to generate multiple image files, and it seems some antivirus software doesn't like it when I call convert.exe multiple times in succession, where it will block some of the instances of convert.exe and in some cases freeze my calling application as well.

Is it possible to get around this issue by sending multiple input text files to convert.exe in one command line argument, so that I only have to run convert.exe once to generate all my image files?

eg. something like
It seems like the answer is no based on:

https://www.imagemagick.org/script/command-line-processing.php#anatomy wrote: The ImageMagick command-line consists of
one or more required input filenames.
zero or one output image filenames

But I just need to make sure before I spend the next few weeks rewriting that entire section of my program to avoid the issue with antivirus programs.

Thanks

pneumatic wrote: ↑2018-04-10T03:55:29-07:00Is it possible to get around this issue by sending multiple input text files to convert.exe in one command line argument, so that I only have to run convert.exe once to generate all my image files?

Code: Select all

convert txt:input1.txt output1.png , txt:input2.txt output2.png , txt:input3.txt output3.png ... etc.

There are a couple common methods to read in multiple image files, modify them in particular ways, then output the results as several files. These examples should help you get started...
That reads in all the specified TXT files, runs whatever operations on them, then outputs the results as separate files named like "output001.png", "output002,png", "output003.png", ... etc.
That reads in one TXT file, runs some operations on it, writes the output "first.png", deletes it from the current IM command, reads in another TXT file, modifies it, writes "second.png", deletes it from the current running IM command, and continues. Don't use "-write ..." for writing the last image in the command since IM assumes the last filename will be an output image.

I recommend just using +write.

Also you can use +write for the last image if you replace the final +delete with null:

Brilliant, thank you.