Jonas Jenwald 1058f16605 Add (basic) support for transfer functions to Images (issue 6931, bug 1149713) ...

This is *similar* to the existing transfer function support for SMasks, but extended to simple image data.
Please note that the extra amount of data now being sent to the worker-thread, for affected /ExtGState entries, is limited to *at most* 4 `Uint8Array`s each with a length of 256 elements.

Refer to https://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs/PDF32000_2008.pdf#G9.1658137 for additional details.

2020-08-17 10:34:12 +02:00

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