Fix image processing

[spacedmonkey]

Summary

Image processing is broken if the image size height is too big. So image size of 9999 breaks the image generation. This PR, simply removes sizes that are too big.

Checklist

• [ ] My pull request is addressing an open issue (please create one otherwise).
• [ ] My code is tested and passes existing tests.
• [ ] My code follows the Contributing Guidelines (updates are often made to the guidelines, check it out periodically).