: What's the best way to downsize alpha transparent images in Photoshop? I'm trying to downsize a very large app logo with alpha transparency in Photoshop CC, but I can't seem to replicate the
I'm trying to downsize a very large app logo with alpha transparency in Photoshop CC, but I can't seem to replicate the sharpness that I get using paint.net.
Below are a couple images I've created to illustrate the problem. I started with a 5000 px circle and resized it down to ~90 px using various resampling algorithms.
paint.net - "Best Quality" / Fant
This seems to produce the best result
Photoshop - Bicubic Sharper
Notice the thickened, blurred outer edges along the sides, top, and bottom of the circle
Photoshop's bicubic smoother, bicubic smooth gradient, and preserve details resampling algorithms all seem to exhibit the same problem as bicubic sharper. The bilinear algorithm has a similar edge-thickening problem, but the edges look a little more jagged. Nearest neighbor is the only resampling algorithm in Photoshop that doesn't seem to thicken the horizontal and vertical edges of the circle, but it results in extremely jagged edges.
Am I doing something wrong? Is there anyway to match paint.net's Fant algorithm in Photoshop CC?
More posts by @Carla748
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Not sure why you'd choose to work this way... but my answer is:
Ctrl + click on the layer thumbnail of your large image.
Go to Window > Paths and at the bottom choose Make work path from
selection
Go back into the Layers Panel and with your layer active Ctrl +
click on the Add layer mask button
Now scale your image, and export
Here is the resulting image:
I have found Photoshop's Bicubic Sharper algorithm useful most of the time, but sometimes, as in your example, it's less than ideal. Even GIMP with it's Sinc(Lanczos3) algorithm makes a better job of reduction with your example image.
However there is a workaround that might help you. Since you have an alpha channel to work with already, if you CTRL(Command on Mac)+click the image layer thumbnail, to make a selection, and then press CTRL(Command)+T, and rescale it by entering the number of pixels in the tool bar along the top, the result is much better. I rescaled the circle to 100 pixels square using that method in the example below, then I cropped it with no resampling.
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