Out of memory on a 64-bit computer?

[NutOfDeath]

I read the sticky and I'm wondering if I can get this error on a 64-bit computer that's only a month old. I haven't even downloaded that much stuff. I'm using the 4.0 beta version, as I got the error on latest stable version as well. I'm opening a 22,720 kb PSD file using the PSD plugin (Photoshop.dll). The error is:

System.OutOfMemoryException: Insufficient memory to continue the execution of the program.

at PaintDotNet.Data.PhotoshopFileType.PsdLoad.CheckSufficientMemory(PsdFile psdFile)

at PaintDotNet.Data.PhotoshopFileType.PsdLoad.Load(Stream input)

at PaintDotNet.FileType.Load(Stream input) in D:\src\pdn\paintdotnet\src\Data\FileType.cs:line 459

at PaintDotNet.Functional.Func.Eval[T1,TRet](Func`2 f, T1 arg1) in D:\src\pdn\paintdotnet\src\Base\Functional\Func.cs:line 156

 

However, a 7,025 kb PSD file works fine.

 

Thanks for helping.

Edited March 10, 2014 by NutOfDeath

[Rick Brewster]

This is an error in the PSD plugin. You will need to ask the author of it why this is happening.

[midora]

As far as I remember the psd file plugin uses some logic to compare the physical amount of memory against the memory needed to open the file in Paint.NET. (CheckSufficientMemory method call in error message). The reason is quite simple.

 

The adress space of a 64bit processor is large enough but if the the physical ram is not large enough to take the expanded psd file in Paint.NET internal format then the processor has to swap memory in and out which will slow down your whole system. Paint.NET will be unresponsive in this time and you will not be able to work with the file after load.

 

The simplified formula to calculate the expanded size in memory is ((Number of layers + 2) * image width * image height * 4).

Each layer will be expanded to the full size of an image.

 

So the author decided to throw an out of memory error quite early instead of letting the user alone with an unresponsive system.

IMHO: A quite good decission.

 

The first thing you should do now is to calculate the expanded size and compare it with the physical ram. If you think there is enough physical ram compared to the expanded then you should contact the author. Maybe the CheckSufficientMemory logic is not correct.