Quote:
Originally Posted by citac
I'm sorry for being so obtuse, but I don't understand any of this.  How in the world can someone edit an image without seeing it directly? |
Happens all the time.
- If you run a server and you need to generate pictures containing text, pictures containing charts.
- If you are a Calibre developer and you need to process covers, or perhaps extract cover image from pdf file
- If you want to process pdf file to series of bitmaps for OCR . This happens inside OCR software.
- if you want to make a foolproof description of how to convert an image so it can be used as cover for PocketBook 360, for example you publish following command
Code:
convert escher01.png -quantize GRAY +dither -colors 4 -rotate "-90>" escher01.bmp
Have a look here for many, many examples of how Imagemagick can be used
http://www.imagemagick.org/Usage/
Quote:
Originally Posted by citac
How do I call the program form the cmd prompt? It's been years since I last used it, and even then I had trouble with it. There's nothing under "Users" on my computer. And what exactly do I do with the quote you provided for me?
 |
Well, it depends on what machine you have.
Let's suppose you have Windows XP
Install Imagemagick from the site.
Now go to start menu, select "run" and type
cmd to the prompt.
A Command Prompt - relatively small black window with a bit of text should appear.
Now type command
convert to the Command Prompt and press Enter.
A long text will scroll in the window - describing all the command options 'convert' command has.
Now, let's forget about Users directory. From Graphical User Interface in windows make directory C:\work and put your files there.
Now, in Command prompt type
C: and press Enter
Type cd
C:\work and press enter
Now you can start working.
If you have bitmap called escher01.png in C:\work for example, you could run command
Code:
convert escher01.png -quantize GRAY +dither -colors 4 -rotate "-90>" escher01.bmp
to convert it into four color dithered greyscale and rotate it (but it will be rotated only if width is greater than height.)