Conversion from RGB to CMYK issue?

[MartinJack52]

Hi everyone,

I created a barcode in RGB (with transparency) with a library in Objective-C. Then I convert it to CMYK colorspace using ImageMagick.

The converted graphic shows transparency when putting it in Photoshop, but not in InDesign.. the RGB one shows transparency correctly in InDesign.

It has the alpha channel. If I open it in Photoshop, save it FROM photoshop to TIFF and import in InDesign, then the transparency appears.

Am I doing something wrong with the conversion as saving it from Photoshop shows the transparency but not directly from ImageMagick?

I use:
convert /path/to/RGB_GRAPHIC.tiff -profile /path/to/cmyk_profile.icc /path/to/CMYK_GRAPHIC.tiff

[fmw42]

What version of ImageMagick and platform are you using? Please always provide that. Sorry I do not know anything about InDesign.