Command+S does not overwrite JPEG'S anymore?

Question

Usually, when I open a JPEG and change it, I could overwrite the existing file with command+S as long as it stayed one layer.

By @wnwka

It has to be flattened for JPEG.

The "one layer" is a special type of layer "Background" from the flatten image command (It can't just be a regular layer capable of transparency named Background).

JPEG only supports 8 BPC (check your bit depth under Image > Mode), It doesn't support Alpha Channels (check your channels panel) and as previously mentioned, it has to be flattened.

Stephen Marsh · Accepted Answer

If you crop with the option to retain cropped pixels, the previously flattened Background layer becomes a floating layer, invalid for direct saving as a JPEG as it no longer meets the restrictive JPEG specifications.

Stephen Marsh · Answer

Usually, when I open a JPEG and change it, I could overwrite the existing file with command+S as long as it stayed one layer.

By @wnwka

It has to be flattened for JPEG.

The "one layer" is a special type of layer "Background" from the flatten image command (It can't just be a regular layer capable of transparency named Background).

JPEG only supports 8 BPC (check your bit depth under Image > Mode), It doesn't support Alpha Channels (check your channels panel) and as previously mentioned, it has to be flattened.

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