Legacy ImageMagick Discussions Archive

Hello!

I´m totally new with ImageMagick. I use Ubuntu x64.

I have a lot of PNG, with indexed color (only black) with transparent Background.

I need different colours of this .png files.
Is it possible with ImageMagick?

Thank you!

To change black into (say) red:

Hello!

Many thanks to this fast reply, but there are still black colors.
Also the transparenz of the black color I lost.

Attached the original and the converted to red.

In the Red Picture you see it is different too the original.

http://de.tinypic.com/r/34nruba/8 (original)
http://de.tinypic.com/r/1zwz2w7/8 (converted to red)

The Hello!

Thank you ... near to the result who I need.
Now it is complete red, but the black parts (with some transparenz) are now filled.
Did you know what what I mean?

The smooth edges of the black color is now hard in red.

For me, IM v6.9.1-0, the alpha values in out.png are the same as in.png.

Hi!

I use Windows 6.9.1-1-Q16-x64 ... maybe this is the problem?

Hello again!

I checked the files .. some are indexed colours, some are RGB.
Is for RGB the same command?

The same command is used for RGB and indexed files.

What version of ImageMagick do you use?

I use 6.9.1.1.Q16-x64 on Windows 8.1 x64.

I also tried 6.9.1.1.Q8-x64 ... same result.

Is there somewhere a link to 6.9.1-0 ?

6.9.1.1 should be fine.

I examined the alpha values with Gimp. My result is:

Ok, I guess with my english I could not describe it clearly.
I have the same result, but it is not same as original.

When you check the original Image, you can see there are some pixel semi-transparent (when you open in Gimp and zoom in).
After convert, it lost this semi-transparent pixel and show full color pixel.

Did you know what I mean?

Thank you for your great help(!)

In Gimp, I zoom to 800% and use the eyedropper tool. This tells me the pixel values. The background has alpha = 0%. The red guitar has alpha at many values, including 1%, 5%, 11%, 12%, 43%, 47%, 77% and 100%.

Ok, that is strange!
Which Version of Gimp you are using?

Hello!

I open the new File with Windows paint, and he show me the image correct.
So it must be a problem of Gimp.

Thank you for your help ... it is solved(!)