Software Screenshot:
Just drag slider to change your picture opacity and preview result realtime, regardless picture format. Also you can see current each pixel R, G, B value and alpha value. Features: Convert image format. BMP, JPG, and GIF to PNG. Detect each pixel opacity/alpha of picture. Change picture opacity. Change opacity of some areas of picture. Change all pictures opacity in a folder. From command line, change picture opacity. Very easy to use, drag bar or move mouse to change picture opacity.
Limitations:
Watermark on image
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