[magick-users] Convert Verify Output File.

[Fred Weinhaus]

Several problems:

1) you have not defined an image - need to add xc:somecolor or an image name
2) space between - and transparent and between - and matte
3) -depth should be at end
4) jpg does not allow transparency - use png


convert -size 512x512 xc:none -depth 8 output.png
will make a completely transparent image

convert input.png -transparent black -depth 8 output.png
will make all black pixels transparent in the input image

What exactly are you trying to create? Please describe what your 
image should look like.


To verify the image do

identify -verbose output.png

or

convert output.png -verbose info:

that will list all the image properties




>Hi All,
>
>Firstly let me say thank you very much for all help provided thus far. I
>am still seeing something kind of strange.
>
>When I perform a convert.
>convert -depth 8 -size 512x512 - transparent black - matte demo.jpg
>demo.rgba.
>
>My Icons seem to be appearing completely transparent for some reason.
>
>1. What's the best way to verify my rgba file
>2. I looked at the properties of the file which said it was 32x32 which
>kind of struct me as odd as I suspected it would be at the very least
>64x64 or 512x512...
>3. I suspect the problem with my images being transparent is my alpha
>values are messed up. I was wondering if anyone could know why/how I can
>check this.
>
>Thanks,
>
>Cheers
>Chris