Why Do I Get a 'Parameter is Not Valid' Error When Creating Large Bitmaps in C#?

Accessing Memory Limits While Creating Bitmaps: Understanding "Parameter is Not Valid" Error

When attempting to create a bitmap larger than 19,000 pixels in C#, you may encounter the "Parameter is not valid" error. This stems from the significant memory allocation required for such large bitmaps. To understand this limitation, it's crucial to delve into the memory consumption formula for images:

bit-depth width height / 8

This formula dictates that a bitmap with dimensions of 40800 x 4050 pixels would consume over 660 megabytes of memory. Consequently, .NET restricts the creation of images that consume such vast amounts of contiguous memory.

To work around this limitation, consider using libraries that support handling large contiguous memory allocations, or explore alternative methods of managing large images. One recommended approach is to break down the image into smaller tiles and process them separately. This technique allows for the loading and unloading of specific tiles as needed, reducing memory consumption.

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