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How do I crop an image diagonally?


Active Member
Hello guys forgive my ignorance I'm kinda new with photoshop.

I got this image:

I'd like to crop off the image from point A to point B, so that The triangle A, B and C disappears leaving the rest of the bar.

Secondly I'd like to place this on top of another picture.

All help appreciated

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You could use the Polygonal Lasso Tool or Pen Tool to make your selection and then hit Shift + Backspace to open up the Fill dialog and select white as the color

Make Selection
View attachment 73218

Hit Shift + Backspace and select white as the Fill Color
View attachment 73219

View attachment 73220

To add the image to another picture just open the picture in PS and place the image above the picture, so the image layer is above the picture layer
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Sorry my bad, this is exactly what the image looks like;


It's actually a green bar without the white background.

I'd like to crop it without any white in the background, so that I can place it on top of another picture. What you did was what I wanted, but I want to do it without the white background.
Is it the same procedure?
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Me, I would use non destructive and editable solutions such as layer masking or the best possible solution would be to use the Rectangle Tool (not to be confused with the Rectangular Marquis Tool)

Use the Rectangle Tool set to shape and the appropriate color, create your rectangle.
Screen Shot 2017-04-07 at 7.59.40 AM.png
Then You can use Direct Selection Tool or my favorite, the Pen Tool to add and subtract anchor points.
Screen Shot 2017-04-07 at 8.00.32 AM.png
This technique requires a little knowledge of paths and path tools, but there is absolutely no time like the present to learn them! It will be the best time investment you can make at this point!

To move, the easiest way would be to just open the image you wish to contain the rectangle, select the rectangle document, then with the Move Tool, drag the rectangle onto the tab of the image you would like to contain the rectangle.

You will place the rectangle on a layer above the image.
Screen Shot 2017-04-07 at 8.11.26 AM.png

Screen Shot 2017-04-07 at 8.11.36 AM.png
On your last post............

I would then use a layer mask.

Use the Pen Tool to identify the section you would like to remove.
Screen Shot 2017-04-07 at 8.26.40 AM.png

Right click and choose "make selection"
Screen Shot 2017-04-07 at 8.26.54 AM.png

Screen Shot 2017-04-07 at 8.28.21 AM.png
Iamsam thanks but I'm still very new to photoshop

Can you like show me step by step what icons you clicked to crop the image, because everytime I use the pen tool to subtract anchor points, I get some weird curves..
Iamsam thanks but I'm still very new to photoshop

Can you like show me step by step what icons you clicked to crop the image, because everytime I use the pen tool to subtract anchor points, I get some weird curves..
Well..........I could but that would take awhile and I need to run to work.

Here are some links:

Video Tutorials on the Pen Tool:




Written Tutorials on the Pen Tool:





You can also use the Polygonal Lasso Tool as Gedstar suggested, it will do the same thing.
the hide selection on layer mask is unclickable...I guess I'm missing something
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Totally agree with IamSam about the value of learning the pen tool.

However if you really are at that stage in your learning use gedstars suggestion.

Use the polygonal lasso tool (if it doesn't show up then left click and hold until the sub-menu comes up - or right click on the icon and select it from the menu).

Create a selection around your top right hand corner using the tool and then press delete. This will give you a shape with the top right cut out. It is destructive (that is by pressing delete you permanently delete the pixels) and if you want to go back and change it in the future you should investigate the use of "Masks". But it is probably the easiest way.

You can then move and use the shape in exactly the way that IamSam mentioned, including using opacity etc.

If you still dont get it - then ask again....


I didn't see IamSams latest post and the problem you are having.

If you don't see the option to "Hide Selection" make sure that you have your rectangle on a layer on its own. If you have it on a locked background layer (Indicated by a padlock on the layer thumbnail) then you wont get that option.


I am going to duck out for a short while, there is some very good advice coming from @IamSam and @gedstar that I am crossposting with. I suspect that by my carrying on I may confuse you which, obviously, was not my intention. I dont want to get in to a "too many cooks" situation :).