[fpc-pascal]How to work with images?

Rainer Hantsch rainer at hantsch.co.at
Tue May 6 11:56:18 CEST 2003


What I want to do all the time, but I never found out HOW to do that, is
working with pictures on a LINUX server.

Note: I do not want to display them (make some kind of new image viewer)! What
I want to do is processing them in a textmode or daemon application and find
out differences between two images, and some similar stuff.

This requires to read in pictures and decode/uncompress them hereby. Then the
picture should be in memory in a usable data format which I can handle easily
with FPC. Finally, if required, I want to store an image back into a file.

For most of that, I guess, there will be ready made and existing libraries
like 'libjpeg', so (I think) there will be no need to re-invent all this
encoding/decoding stuff.
When I visited a friend (he plays around with Windows-FPC), I saw his
application, written in FPC and doing most of that - but it uses
Windows-DLL's, so this is of no help to me, but it shows me that I am not so

Is somebody out here who can leave me a sample program which shows me how to
use a shared library for reading/writing i.e. a JPEG file into/from memory?
Thanks in advance!


  Ing. Rainer Hantsch

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