Poke a hole

[MahaB82A]

This video explains poking hole on JPNG JPEG image. I cannot understand what is the function of Alt key here.  For me after using the Quick Selection tool to select image what we want to poke & selecting the adjustment layer in the layer panel & pressing delete key gives the result.

Can anyone undestand function of Alt key mentioned in this video? because for this work I assume Alt key is not necessary.    

[Test Screen Name]

There is no JPNG. There is JPEG and PNG. They are very different, which one do you work with?

[MahaB82A]

Sorry I had made a mistake. It is JPEG.

[kevin stohlmeyer]

Hi @MahaB82A Alt key is a modifier for selection tools that changes your tool to deselect areas instead of adding to the selection.

[PECourtejoie]

Hi, @MahaB82A  look this step by step that explains the basics of selections: https://helpx.adobe.com/be_en/photoshop/how-to/selection-tools-basics.html

or also: https://helpx.adobe.com/be_en/photoshop/using/adjusting-pixel-selections.html
Have fun learning Photoshop!

[davescm]

Del fills the selected area of the mask with the current background colour. Alt+Del fills the selected area of the mask with the current foreground colour. Depending on how the foreground and background colour are set the impact is different.

Dave