I have a simple task to complete with Photoshop that i'm not able to do. 

I have an image which i want to select an area and delete it without anti-aliasing, i want to cut to the exact selected pixels. 
I don't understand why it always apply anti-aliasing and delete outside of the selection border, and the anti-alias checkbox is grayed and uncheked. 

1 Answer
1

Are you deleting with the eraser tool or by using the marquee tool to select then hitting the delete button?  If it is the eraser, you are probably using a soft brush, if the marquee, it could be your refine edge settings. 

Either way, you should almost never use either of these options in Photoshop.  Instead use a layer mask.  A layer mask applied to your layer can drive the visibility in a non-destructive manner.  Basically you paint in black and white on the mask, where black is transparent, grey is semi transparent, white is fully visible. 

The huge advantage of the non-destructive workflow is that you never actually delete any pixels - you just hide them.  Later if you want them back, you can just paint them back in your layer mask. 

Thanks for your help John, but even with the layer mask I have the exact same problem.  I clicked on "Add mask", I selected a zone with the marquee tool, painted it in black with the paint bucked, and I get the same result shown in the image above. 
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JonathanOct 31 '13 at 14:41

But the Refine edge settings was the solution !  Constrast was at 0%, setting it to 100% solved the problem, thanks ! 
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JonathanOct 31 '13 at 14:54