size of a bitmap

Hi guys,

I wonder what is the maximum size of a bitmap in memory... I am creating a big bitmap, let me correct it, a huge bitmap... Delphi seems unable to create it.

best regards,
Manuel Lopez
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feloniousConnect With a Mentor Commented:
Ok, well I played around with the tfilestream idea, and the general concept is sound.  i tried this method on a Jpeg that was 6,720KB and it worked fine.  then I wanted to see what would happen if I just used JPEG.SaveToFile and that worked also.  so.....  what version of Delphi are you using?  I'm in Delphi 6 and JPEGImages' SaveToFile worked great.  BUT, heres what I was playing with.. tell me if it works for your version of Delphi.

  JPEG : TJPEGImage;
  FS : TFileStream;
  FSFilename : String;

  FSFilename := 'c:\test_out.jpg';
    JPEG := TJPEGImage.Create;
// Delete file if it exists, otherwise what we save to the TFileStream will just get appended to the end of the file
    if FileExists(FSFilename) then DeleteFile(FSFilename);
    FS := TFileStream.Create(FSFilename, fmCreate);


// Save to TFileStream

// I Put this in just to test and see if it would work.

I just stuck this in a Buttons OnClick event to test.

Mohammed NasmanSoftware DeveloperCommented:
  Yes, there's limit in creating Huge bitmap images, but this limit not from delphi, it's from windows, if you need to create huge bitmap, see this article

Best regards
Mohammed Nasman
just curious as to what a "huge" bitmap is (size wise) and why you would need to create such a big bitmap.
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lopemAuthor Commented:

Hi Felonious,

I wrote a photomosaic program. I have to build the mosaic from a jpeg library. I can build it without problem, but at the time to save it, the jpeg unit gives to me an error message saying it can do the saving operation.  I think problems start at the 2 megabytes limit of the jpeg library of delphi.

best regards,
manuel Lopez (lopem)
interesting.  have you tried to save the final jpeg to a tfilestream and then save to file?  this may be a way around the problem, but i haven't tried it.
lopemAuthor Commented:

No, I have to be honest. I dont know how to do that. Can you help me? I found the Intel JPEG library with the header for delphi. I have to try it... But if there is a physycal limitation, probably the best option is to build the image in parts and then process it with Photoshop.

Anyway, take a look to my page with some samples of the photomosaics...

By the way, supposedly you can send your own image to photomosaic it but this feature is disabled because a technical problem with the server.

best regards,
Manuel Lopez (lopem)
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lopemAuthor Commented:
let me check your code...

thnask in advance,
Manuel Lopez (lopem)
Here is a case where an expert took the time to code, and it remains open more than one month later.

Please finalize this and assign a fair grade.

Moondancer - EE Moderator
lopemAuthor Commented:
Cool! I have to work around it a little but it seems the right answer.

best regards
Manuel Lopez (lopem)
Thanks for returning and finalizing this.
Moondancer - EE Moderator
To felonious:
I tried your method to save a 7800x4680 size jpg picyure, I got not of enough error.
I am using Delphi7 in WinXP OS with 512MB memory, can you tell me why?
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