Legacy ImageMagick Discussions Archive

for example

convert flower.jpg -background transparent -rotate 45 out.png

will have a transparent background

you'd think setting a color to transparent would enable alpha.. or some consistency.

Anyway thanks for tip!

Ok, that works, but it's weird that in other places I use -background transparent it works without -set alpha!?

Was using this in IM 6

How do i get a transparent background?

flower.jpg


convert flower.jpg -background transparent -shear 12x0 png:output.png

im 6.7.2


img 7.0.8

Thanks so much!

Not sure if this is a bug or if changes in implode or how region works in IM 7

Any idea on what's going on or how to fix?

flower.jpg
https://i.imgur.com/Pn47J4f.jpg

convert -region '150x150+50+50' -implode 1 flower.jpg out.jpg
IM 6 out.jpg (desired)
https://i.imgur.com/WSFBwOU.jpg

magick ...

Hi,
Working through the changes in IM 6.7.2 to IM 7.0.8 ..

Any way to make implode region more uniform like in IM 6 (ie, with out the box )

flower.jpg
https://i.imgur.com/Pn47J4f.jpg

convert -region '150x150+50+50' -implode 1 flower.jpg out.jpg
IM 6 out.jpg (desired)
https://i.imgur.com ...

I'm trying to find the best way to deal with bad colors being input..

For example:
# convert -fill darkgold label:Test test.gif
convert: unable to open image 'darkgold': No such file or directory @ error/blob.c/OpenBlob/3497.
convert: no decode delegate for this image format `' @ error/constitute ...

Ok, thanks. I wouldn't have though that!

That doesn't work, I still get the same thing.

added the inputs above. ... with your changes still see the same problem. reversing order doesn't work though.
magick -gravity center -compose CopyOpacity input.jpg shamrock.gif -resize 400x300 -composite out.gif

What happened to -radial-blur ?

convert test.jpg -radial-blur 300 out.jpg
convert: unrecognized option `-radial-blur' @ error/convert.c/ConvertImageCommand/2637.

convert --version
Version: ImageMagick 7.0.8-59 Q16 x86_64 2019-08-04 https://imagemagick.org
Copyright: © 1999-2019 ImageMagick ...

Or, this one, I'm trying to cutout a shape from the image

composite input.jpg -gravity center -compose CopyOpacity shamrock.gif -resize 400x300 out.gif

input.jpg
https://i.imgur.com/1C4TY69.jpg
shamrock.gif
https://i.imgur.com/T1H5yI3.gif
With im 6 I get:
https://i.imgur.com/QV22FvH.gif ...

Ok, how about this one:

composite input.gif -compose src-over blend.gif mask.gif output.gif

The mask being a black and white shape.

I'm guessing I have to convert the black and white to alpha channel?

That works great, thanks!

I'm trying to update a number of scripts to IM 7. Many involve transparency or overlays that seem to be messing up.
I still don't quite understand the changes from transparency to alpha

Does anyone have a simple this => that for conversion list of 6 to 7 ?

Here is an example :
convert black.png ...