OverlayWith JPEG input, JPEG output

[rahbari]

When OverlatWith is used on a jpeg input and the output is jpeg as well the produced image is weird:

sharp('test.jpg').overlayWith('overlay.png').jpeg().pipe(res);

When input is png and output is jpeg or when input is jpeg and the output is png or webp the result image is ok. This happens on both Windows and OSX, I haven't tested linux yet. My vips version is 8.2.2 on mac.

[lovell]

Hello, the forthcoming v0.14.0 will contain many improvements to the overlayWith feature, including support for 16-bit PNGs (which is what this example looks like). Are you able to test with the needle branch?

npm install lovell/sharp#needle

https://github.com/lovell/sharp/blob/needle/docs/api.md#overlaywithimage-options

[lovell]

See #239

[rahbari]

Hello lovell, thank you for this great library.
I used photoshop "save for web" to create the overlay file. I tested 24bit PNG as well as 8bit png. In both case output is corrupted. This happens only when the source file is jpeg and the output is jpeg as well. I will test the needle branch now and update asap!

[rahbari]

The needle branch works ok with the same files! thank you so much lovell. when this branch is released?

[lovell]

Great, glad to hear v0.14.0 will solve this problem, thanks for confirming. Please subscribe to #239 for release updates.