FIX: using high resolution images on iOS as localSourceImage yields blurred outputs

[ian-wd]

Tested the suggested fix from THIS thread and it seems to work well on my testings

Updated example app to include several images for testing.

Before

After

Notes:

• issues seems to only occur when very large images are being downscaled
• unable to reproduce the issue on android
• don't see a need to add a prop for this since it's an iOS only fix

Fixes:

• fixes #68