Image file format tutorials?

Dudley Hanks wrote:
> Anybody know of a good book or web site with info on the file
> structure of the basic image types? (jpg, png, gif,
> etc)
>
> I want to code something that will help me manipulate images, but
> it's proving difficult to find anything other than libraries of
> functions written for sighted individuals.
>
> I figure if I can decipher the file structure, then I should be
> able to do my own version of HDR, multi-exposures, colour
> shifting / substittution, blurring, etc...
>
> Appreciate any info you might know of.


I would advise working with libraries, or a command line image processor
(imagemagick, netpbm) or even scripting
for a desktop app (Photoshop and Gimp are scriptable).

Coding format handling yourself gains nothing, and wastes
time.

BugBear
 >> Stay informed about: Image file format tutorials? 

On 26/10/2010 15:43, Dudley Hanks wrote:
> Anybody know of a good book or web site with info on the file
> structure of the basic image types? (jpg, png, gif,
> etc)

Of the basic books John Miano's "Compressed Image File Formats" is OK.
There is even a CD with some basic bits and pieces on it.
>
> I want to code something that will help me manipulate images, but
> it's proving difficult to find anything other than libraries of
> functions written for sighted individuals.

??? How will you know if you have succeeded ?
>
> I figure if I can decipher the file structure, then I should be
> able to do my own version of HDR, multi-exposures, colour
> shifting / substittution, blurring, etc...

It is a lot harder to do than it sounds. Decoding and encoding the files
is the trivial part and quite honestly best left to standard libraries
like the IJG JPEGLIB or another equivalent one.
>
> Appreciate any info you might know of.

The full standards document for JPEG is about the thickness of a
telephone directory. It will take you a very long time to read.

Regards,
Martin Brown
 >> Stay informed about: Image file format tutorials? 

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 >> Stay informed about: Image file format tutorials? 

shiva das wrote:
>In article ,
> Dudley Hanks wrote:
>
>> Anybody know of a good book or web site with info on the file
>> structure of the basic image types? (jpg, png, gif,
>> etc)
>>
>> I want to code something that will help me manipulate images, but
>> it's proving difficult to find anything other than libraries of
>> functions written for sighted individuals.
>>
>> I figure if I can decipher the file structure, then I should be
>> able to do my own version of HDR, multi-exposures, colour
>> shifting / substittution, blurring, etc...
>>
>> Appreciate any info you might know of.
>>
>> Take Care,
>> Dudley
>
>I have no idea if this is up to date in the second edition, but when
>when I read it it covered more formats than I had a clue existed:
>
>Encyclopedia of Graphics File Formats, Second Edition
>By: James D. Murray, William vanRyper
>Publisher: O'Reilly Media
>Formats: Print
>Print Release: May 1996
>Pages: 1,152
>Print ISBN: 978-1-56592-161-0 | ISBN 10: 1-56592-161-5
><http://oreilly.com/catalog/9781565921610>
>
Hey, thanks, that sounds promising.

Since O'Reilly's the publisher, it might even be on Safari,
which would be great, as their EBooks are a lot more accurate
than scanning the material manually.

Thanks,
Dudley
 >> Stay informed about: Image file format tutorials?