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Re: Computer Picture Problem


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Posted by MarkB_MI on July 10, 2013 at 19:11:08 from (75.219.38.123):

In Reply to: Computer Picture Problem posted by John T on July 10, 2013 at 12:14:04:

John, it sounds like it worked out OK, but there are better ways to do this. The problem with copying and pasting is that you're copying the image at screen resolution, even though the actual file resolution is probably much higher, as is the resolution of your printer.

Thanks to the hippies and socialists in the open source software movement, there are plenty of free alternatives to PhotoShop. The most well-known is "GIMP" (GNU Image Manipulation Program). You can download it from www.gimp.org.

For this sort of work, I prefer to use a set of command-line tools known collectively as ImageMagick (www.imagemagick.org). Command-line tools may seem like an anachronism in this day and age, but us UNIX hacks use them all the time. Using the ImageMagick "convert" tool to invert an image is ridiculously simple:

convert original_file.pdf -negate inverted_file.pdf

I'd like to see anyone do that in Photoshop faster than I can type. Give me a hundred PDFs or JPEGs to convert and I'll throw together a little script and convert them all in the time it takes Photoshop to load. Give me a thousand and I'll sit back and have a beer while the PC cranks them all out.


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