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c# want to save large bitmaps

jramrus
jramrus asked
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Last Modified: 2008-01-09
I believe this is an easy question. I currently make a bitmap object and then save it to disk. If the amount of data I am trying to turn into a bitmap is too large, my application complains with an 'out of memory' error. Is there a simple way to do this in pieces, meaning make a part of the bitmap image, save it to disk, make the next part, save it to disk, etc. etc.

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can only suggest that you don't use a bitmap, consider using a compressed format instead like jpeg or gif.
Top Expert 2006

Commented:
How much data are you working with, or how big is the bitmap you are creating?

Commented:


Just before you convert your data to bmp, you may want to run the Garbage Collector.  

GC.Collect()

Generally it's not a good idea to run the garbage collector because it adds overhead.  but if you want to clear up some memory for a large process, GC.Collect may be an easy fix

Commented:


Just before you convert your data to bmp, you may want to run the Garbage Collector.  

GC.Collect()

Generally it's not a good idea to run the garbage collector because it adds overhead.  but if you want to clear up some memory for a large process, GC.Collect may be an easy fix

Commented:


Just before you convert your data to bmp, you may want to run the Garbage Collector.  

GC.Collect()

Generally it's not a good idea to run the garbage collector because it adds overhead.  but if you want to clear up some memory for a large process, GC.Collect may be an easy fix
Top Expert 2006

Commented:
What kind of data are you turning in to a bitmap?  Can you provide a sample?  It may be easy to create the bitmap directly instead of depending on GDI+.

Author

Commented:
I'm talking about the 300Mb range being shoved into the bitmap function. I do not believe running the gc.collect will help, all it will potentially do is delay the threshold where it starts failing. I'm hoping for something that will allow me to create huge bitmaps by writing them one piece at a time. I imagine it will be slower, but I had to guess it was an option. Maybe not??

It is just image data, nothing fancy about the data itself.
Top Expert 2006
Commented:
It is certainly possible to create a group of bitmaps and combine them into one large bitmap (for example: 12 bitmaps that are 256 x 256 could be combined in to a single bitmap that is 1024 x 768).  As you are receiving an "out of memory" exception, you can not do this through GDI+ (i.e. System.Drawing.Bitmap, etc.), but you could create your own function.  You will need to work with the bitmap file format directly, and a reference follows.

  The .bmp file format
  http://www.fortunecity.com/skyscraper/windows/364/bmpffrmt.html

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Author

Commented:
Can you still use the c# 'bitmap' function in conjunction with this to do the compression? Or is this just a way to do the entire bitmap file writing by hand?

Yes, I am receiving an 'out of memory' exception, and I am under the assumption that the error actually means I am out of memory.
Top Expert 2006

Commented:
This is a way to create the entire bitmap "by hand."  You can use it to write a method that would combine multiple small images that have been saved to disk, into one large image.
Top Expert 2006

Commented:
jramrus, is there anything else we can offer to help solve your question?

Author

Commented:
so is there an open-source project or existing library that exists that allows you to write in a bitmap in pieces? I always knew I could write the bitmap by 'hand', but I was hoping that there was a better option.
Top Expert 2006

Commented:
I didn't come across any while searching.
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