Legacy ImageMagick Discussions Archive

Composite command not maintaining transparency

Issue:- We are trying to apply watermark on an image using composite command and not getting the desired results with latest version of Imagemagick 6.8.8-2 Q16 x64

When I say desired results - The watermark image is having a transparent background, so when we apply the watermark on any image it should be overlapped on the image, but we are getting a fog kind of layer on the watermark

Command that we are using
composite -dissolve 75% -gravity northwest C:\Users\harold.w\Desktop\InputImages\WaterMarks\watermark_dis.psd[0] C:\Users\harold.w\Desktop\InputImages\Tulips.jpg C:\Users\harold.w\Desktop\Output\Final_Out_Water.jpg

The same command is working fine and producing the desired output on ImageMagick 6.8.7-4 and ImageMagick 6.5.4-7 but failing on the latest version of ImageMagick, is this a bug? Please see the screenshot below
https://www.dropbox.com/s/zwng2anhve1p3 ... g_Diff.jpg

Watermark PSD image - https://www.dropbox.com/s/uqrf9w2m26g2m ... rk_dis.psd
Image on which we trying to apply watermark - https://www.dropbox.com/s/u8iag8t551oz24j/Tulips.jpg

Your command works fine for me, on IM v6.8.8-0 on Windows 8.1.

snibgo wrote:Your command works fine for me, on IM v6.8.8-0 on Windows 8.1.

Code: Select all

composite -verbose -dissolve 75% -gravity NorthWest watermark_dis.psd[0] tulips.jpg out.jpg

Oh !!
As I said its working on ImageMagick 6.5.4-7 & ImageMagick 6.8.7-4 with Windows7. You confirmed its working on IM v6.8.8-0 on Windows 8.1

Can we confirm if this is a bug in latest Imagemagick 6.8.8-2? If any other user can confirm, then i'll post this in "bugs" section

Your watermark PSD image has background transparency only and I suspect that IM only looks for alpha channel transparency. It can only handle one or the other and apparently only works with alpha channel transparency.

Tested with IM 6.8.8.4 Q16 Mac OSX.

So I get something like your top image, where you see 75% white background in the composite from the watermark image.

Try exporting your PSD file from PS as PNG or Tiff and try that. It seems to work fine for me that way.

I can confirm this is a bug and it will be fixed in the next release of ImageMagick (6.8.8-5) I broke this when adding support for reading zip compressed layers.

dlemstra wrote:I can confirm this is a bug and it will be fixed in the next release of ImageMagick (6.8.8-5) I broke this when adding support for reading zip compressed layers.

Thanks for confirming it's a bug and then moving the topic to "Bugs" section. When can we expect the next release i.e., ImageMagick (6.8.8-5), any expected date?

6.8.8.5 should be available this week, Sunday at the latest, likely sooner.