I'm fairly new to Photoshop and hoping someone can advise if this is possible - I've taken a photo of an object (dish towel) which is nominally rectangular but in real life is slightly irregular. I want to know if there is a way I can select the outline of the towel (obviously I can do this part!) and stretch it to fit a perfect rectangle? I've included a photo (pixelated to protect IP) and you can see it's slightly irregular, though a bit of minimal stretching to make the edges straight wouldn't hurt the image and should look OK. Any suggestions would be welcome, thanks.
You could use a combination of the perspective crop tool, crop tool and rectangle marquee tool. I extended the right side with the crop tool after using the perspective crop tool, made a selection of the left side with the rectangle marquee tool and copied that to it's own layer then moved it over to the right side to fill in the gap from the crop tool, rotate by 180 degrees.