Can Apple's Preview app be used to reduce the opacity of an existing image?
I might be asking this wrong. To be clear, I've Googled it extensively but Google seems to think what I want is to remove a solid background from around my image, for example making a the black background/backdrop transparent in an image that's of a car. However, my background is already transparent and what I want is for the car to be at about 90% Opacity.
Best Answer
Preview
can't do this.ImageMagick
can, and nearly anything you can imagine.You can easily install it with
MacPorts
(see MacPorts Home):Let's say your original image is
porsche-911.png
:Enter in
Terminal
the following command:which will compute from your original input
porsche-911.png
the outputporsche-911-50%.png
:If you want to learn more about this great free tool, read:
ImageMagick home.