Legacy ImageMagick Discussions Archive

Hi there,
I'm very new (2 days experience) to this great tool so I apologise if this is simple. I've googled a lot to resolve it!

I'm trying to create a tool which will stamp a semi-transparent colour label on top of images which may be B&W, greyscale or colour of varying depths. When I use the code below it works for colour images ok, but for B&W it dithers it (unreadable) and for greyscale it is so faded it can't be seen. Here is the code:-

convert 13.tif label1.gif -set colorspace sRGB -gravity northwest -geometry +3+3 ^
-define compose:args=40,100 -compose dissolve -composite result.tif
convert result.tif result13.pdf

Thanks for any assistance,

Hunter

What version of Imagemagick are you using?

Try
Why do you copy the output to a different name? Why not just use the final name in this line of code?

Can you post your input images to some place such as dropbox.com and put the URLs here?

Hi there,
Thanks for the reply. Sorry for the delay - I was expecting the forum to email me notification of any replies.

I've tried what you sent and sadly it didn't work. I'm using ImageMagick-6.9.2-8-portable-Q16-x64.

I'll reply soon with a copy of the example images.

Thanks for your help!

It should have notified you if you set your post or profile to send you email. Perhaps it went to your spam directory or was filtered to trash.

What does not work about the result?

An example with input images and what you expect for the output (at least a description) would be helpful.

If the image is already semi-transparent, then you could just use -compose over -composite, since the semi-transparency would act as the blending factor.

Here are the files...

2.tif - https://www.dropbox.com/s/c2o2f1xdf05jt9d/2.tif?dl=0
12.tif - https://www.dropbox.com/s/pocxn3jrc4t2i4r/12.tif?dl=0
label1.gif - https://www.dropbox.com/s/woydt9aaidmv5 ... 1.gif?dl=0
result_from_2.tif - https://www.dropbox.com/s/ubzrugwv9wew8 ... 2.tif?dl=0
result_from_12.tif - https://www.dropbox.com/s/he3bz2ge58c4l ... 2.tif?dl=0

There seems to be a bug with bilevel tiff input. It works if you convert your 2.tif to 2.png.
I will report this on the bugs forum and see what they say.

Thank you for fixing my issue and also logging the bug.

I'll try changing this post to solved - not used this forum before.

THanks again!

Not a bug. Just need to use -depth and -compress. See viewtopic.php?f=3&t=28820&p=128243#p128241

Hi there - sorry I'm pretty new to this and also for completeness for other people who have this issue. What would you recommend I change the code to to negate the need of converting to png first?
As I also need convert PDF's which are a hassle to convert to png and combine again?

THanks,

Neill

The command was listed in the link above and here at

viewtopic.php?f=3&t=28820&p=128243#p128241