Size-transformed image still retains the original canvas size

[John Rostron]

I have a pixel image, and I have used the Transform tool to reduce the size to 800px high. The visible image is indeed re-sized, but within the original canvas. The remains of the canvas are transparent, and of the original document size. The Transform tool gives the re-sized dimensions. I am trying this out with the aim of writing a macro involving re-sizing the entire image using a formula. How can I resize the canvas as well as the image using a formula?

[toltec]

I don't know if it is exactly what you want but you could get rid of the transparent canvas by going Document > Clip Canvas

 

Otherwise you will have to resize the whole document.

[MEB]

Hi John Rostron,

The transform commands (from the Transform panel) are only applied to the selected layer(s) not to the document as a whole. If you want/need to resize the whole document you must use the File ▸ Resize Document command (or integrate it in a macro).

[John Rostron]

Thanks @toltec and @MEB. The Clip Canvas works fine. I had been trying Document > Resize Document, but this does not seem to accept formulas.

One curious outcome is that for a 3000×4000px  portrait image, after a successful transform/clip, The Transform panel gives the dimensions as width: 800:px by height:600px. The Document Resize gives it (correctly) as width:600px by height:800px