A few small patches to image handling #3082
Merged
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tweak double-encode logic for image data
Instead of only b64-encoding for valid image data, b64-encode unless it is specifically detected as b64-encoded valid image data. This prevents garbage data from skipping the b64 step, and causing unicode errors.
check image header to identify image type
allow Image("filename")
We already support passing a URL this way, it's silly to not support passing a filename, as user reports have shown many times.
Closes #3081