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There is a hard-limit of 30,000,000 bytes for any image, audio, video, foreign object, document brought into Realm Works.
We warn for images over 12,000,000 pixels (comparable to a 4,000 x 3,000 image) in size but still allow them to be loaded.
The hard limits on size are very dependent on system resources and when during a session you try and load the image. If it is very early before doing much in Realm Works, it may be fine for a certain size. If you try and load the same image after having been working a lot with Realm Works, you may get the out of memory exception. This is due to using more memory as you run and also memory getting broken up into smaller pieces (memory fragmentation) which means allocating the memory for the image as one chunk is not possible.
And as stated, multiple images are needed at a time when manipulating smart images. And those images need to be uncompressed.
So if you loaded up a 4,000 x 3,000 pixel image, it would use up around 48,000,000 bytes when it is uncompressed in memory. Now figure you have a reveal mask of the same size.... And then a combined image of the two of the same size.... And if you have an overlay, there's another one needed.
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