Is there a way to directly paste PNG images in Photoshop and keep their transparency? I don't mean dragging them, but directly pasting from, for example, a browser. Transparency is always replaced by black.
There is a plugin for Firefox: Open with photoshop that does what you want, and actually does some of the work for you.
The way it works is: You right click an image and choose "Open in photoshop", and that is exactly what happens ( Not to mention pngs maintain their transparency ).
It does work pretty well, though it doesn't open up the images 100% of the time ( at least on mac/cs6 ).
It also has a feature to open background images.
A bit of an old topic but thought I would contribute...
I normally save the image and open in PS however I found a better solution today. It's still a bit of a pain but at least you won't have temporary image files and also saves the hassle of browsing to the file itself.
Simply right click and copy image URL (or similar), or copy the address bar link if you used "view image" in Google search.
In PS, go to Open... and then paste the URL in the File name box and click open.
Note that this technique will only work on Windows currently - OSX has no option to open URL directly from an open dialog window.
The easiest way to do this would be to save a copy of the PNG and then open it in Adobe Photoshop. This preserves the transparency.
The downfall of this method is that you would have to remember to delete the file afterwords, if you don't want to keep it. Alternatively you could download it to the temp folder.