[SOLVED] How can I create a png or jpeg file programatically ?

alanv · 10-03-2010, 03:07 PM

Hello,

Given a matrix with 0,1 entries, how can I create a graphic in linux such that we have a black square or pixel if the entry is one and white otherwise?

For example, if the matrix is:
0001000
0011100
0111110
0000000
then I want a graphic that looks like:
███████
███████
███████
███████

I will be working with many large matrices, e.g. 1000x1000, or 5000x1000 so I need to do this automatically.

Your help is greatly appreciated.

Alan

TobiSGD · 10-03-2010, 03:10 PM

Depends on the programming language you want to use. And if you know that, the answer is only one "googling" away.

alanv · 10-03-2010, 03:15 PM

Quote:

Originally Posted by TobiSGD

Depends on the programming language you want to use. And if you know that, the answer is only one "googling" away.

I know how to do it using software, e.g. matlab, maple, mathematica, etc. I "googled" it and all I found was that type of software. But preferable I would like to use only a sh file.

Anyone has any idea besides telling me to go google it ?

markush · 10-03-2010, 03:15 PM

Hello alanv,

you should google for svg (scalable vector graphics)or xpm. xpm should meet your requirements.

Markus

John VV · 10-03-2010, 03:21 PM

use imagemagick's c++ hooks
or from the terminal

you and also use " CImg.h" in the program code
there are about 100 different things and a 100 different ways

alanv · 10-03-2010, 03:21 PM

Quote:

Originally Posted by markush

Hello alanv,
you should google for svg (scalable vector graphics)or xpm. xpm should meet your requirements.
Markus

Great! I think xpm is what I was looking for. I will leave the thread open for a while in case there are more suggestions.

Thanks

Alan

alanv · 10-03-2010, 03:42 PM

When looking for xpm, I found pbm and it is the best option for my needs.

The format would be

P1
7 4
0001000
0011100
0111110
0000000

and then I would save it as pbm, that's it. It would directly handle the matrix. This can easily be done with a sh file (I would just need to add P1 and the size of the matrix).

Thanks.

Alan