Let's first resize the canvas to a resolution of 2048 x 2048, go to Image > Resize Canvas.
Scale the barrel layer down using Ctrl + T and holding Shift + Alt -keys to scale proportionately and towards the pivot point. Also make sure it is set to Free (see top right corner).
Add a Filter Layer > Enhance > Sharpen (Above the barrel layer).
While the Sharpen filter is selected, press D to "Default the colors" and make sure the color is black (Use X to swap between the primary and secondary color).
Use Shift + Backspace to fill the sharpen filter layer with black, removing the sharpening effect.
Press X to use white (100 value, 0 saturation) and use a soft airbrush brush to draw in the sharpening effect.
Go to File > Export and save the image as a .png called barrel_albedo.png with alpha transparency enabled. Save the file in a location that makes sense, or in my case assets/lib/textures.
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