HOW TO
The image memory limit is based on the desired maximum size of an output image and its resolution. By default, the image memory limit is 4 MB, which allows output image dimensions of 1024 x 1024 pixels (that is, 1048576 pixels). Any request for an image exceeding this size will result in a "Requested Image too big and cannot be created" error.
For ArcMap services, consider the page size of the layout when determining the image memory limit.
Note:
The file size of an ArcMap Service layout request in a vector format (ai, emf, eps or pdf) is not restricted by the image memory limit.
Article ID:000005224
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