[FFmpeg-user] How to make partially transparent png image

[compname at verizon.net]

At 6/27/2015 09:02 PM, you wrote:
>Hi,
>
>
>In normal png file, there is no alpha channel, and there is color in 
>the background. If there is alpha channel in png files, the 
>background can be transparent, and the object in png file can be 
>partially transparent.
>
>
>How to make a png file with alpha channel, so that, the background 
>is transparent and the object is partially transparent? Could ffmpeg do it?

Since ffmpeg is a video processing tool, even if it could I wouldn't 
recommend it.  I used another free tool: IrfanView.  I believe you 
can load an image into it & tell it to make a certain color/range of 
colors transparent.