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I have a large .tiff,about 2.2G, I want to change it to png or jpg in C#/GDI+,but when I load it,it throws "Parameter is valid","Array dimensions exceeded supported range".

What I have tried:

I try it like this:

byte[] buffer = null;
using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read))
    buffer = new byte[fs.Length];
    fs.Read(buffer, 0, (int)fs.Length);

... or like this:

FileStream pngStream = new FileStream(file, FileMode.Open, FileAccess.Read);
var image = new Bitmap(pngStream)
Updated 9-Oct-19 1:33am

1 solution

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Solution 1

You can't: Creating a File Mapping Object - Windows applications | Microsoft Docs[^]
The size of a file mapping object that is backed by a named file is limited by disk space. The size of a file view is limited to the largest available contiguous block of unreserved virtual memory. This is at most 2 GB minus the virtual memory already reserved by the process.
And since your tiff files exceeds that, and tiff is a compressed format, you cannot use GDI+ to load that file at all.

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