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I need to export a layer from a PSD file into a PNG but I don't know how to do it correctly because if I hide the background layer it looks totally different:
With background:
Without background:
How do I get rid of the black stuff on the second image?
The black stuff you are talking about is part of the gradient. You can't really remove it entirely. There are 2 ways to reduce the effect, however.
Set the image on a background and use a blending method/filter, as you would in PS. For this you will have to research techniques for your given development language.
Reduce the "spread" of the black in the image by further reducing the size of the mask and feather it a bit.
Use a selection tool to make a selection.
Choose Select > Modify > Expand or Contract.
For Expand By or Contract By, enter a pixel value between 1 and 100, and click OK.
The border is increased or decreased by the specified number of pixels.
Check out this tutorial on feathering a selection for details.
Additionally:
As mentioned by @ErickP, "when creating a gradient that goes from one color to transparent, make sure the transparent color is "white" (or the same solid color)...you usually don't notice when it's on a background but very noticeable once the background is taken away"
