Photoshop post processing
Cutting images from their background in Photoshop can be fairly easy, but some images are time-intensive to edit correctly. I'm going to show you a trick that will save you valuable time when you need to remove the fringing from cut-out images. This fringing is also known as a "halo", but it can be easily fixed with a mask and simple filter. I'll just be demonstrating how to remove fringing today and won't cover the various ways to cut images in Photoshop.
Open the image you want to cut in Photoshop.
Using your preferred method, make a selection of the cutting zone. In this case, I simply used the Quick Selection Tool (W) to make a selection on the purse.
With the selection active, go to Layer > Layer Mask > Reveal Selection.
Go to Layer > New Fill Layer > Solid Color. Name this layer as "Color Background" and click OK.
In the Color Picker window, set the color to black (or any other dark color you want) and click OK.
With the "Color Background" layer active, go to Layer > Arrange > Send to Back.
As you may see, once we apply the mask to the object some fringing appears. To remove it, click on the Layer Mask Thumbnail of your image to make it active.
With the Layer Mask thumbnail selected go to Filter > Other > Minimum.
In the Minimum filter window, set the "Preserve" option to Roundness, adjust the Radius until you see no halo on your image and click OK. In this case a value of 0,6 px seems to work fine.
As you saw, removing fringing from your cut out images is easy if you know which tools to use. The best part of this technique, is that it does not matter if the fringing on your image is white, black, red or multicolored because by using the Minimum filter over your layer mask you can easily control how much of your layer mask selection is contracted without loosing your original selection. Also, this technique gives you even more control over your layer mask rather than using the "Contract Selection" method because you can use decimals (instead of just whole numbers) to precisely control the contraction.