convert to Tiff has Grayscale not RGB why?

[forenhopper]

Hi,

i use this command:
convert.exe -compress LZW -depth 8 -colorspace RGB -format tiff 1.jpg 1.tiff

The Problem is that this command gives me a tiff with grayscale colors. But i need RGB. If -colorspace is CMYK the result is CMYK. But RGB does not work.

I can not use the grayscale File because the Programm where it must be load can not read it. If i change in Photoshop to RGB evertything is fine.

[forenhopper]

Ok CMYK does not work everywhere:

montage.exe -background #FFFFFF -colorspace CMYK -format tiff -depth 8 -compress LZW -geometry +4+4 1.jpg 2.jpg 1.tiff

Without CMYK i get my grayscale tiff. With -colorspace CMYK i get an empty Image with the size of 1.jpg.

If i motage first and then use convert.exe i get my CMYK image...

[fmw42]

read http://www.imagemagick.org/Usage/formats/#tiff about tiff format and limitations and format types

convert syntax usually has the input image right after convert, e.g.

convert.exe <input> .... <output>

-format tiff is probably not needed as it is typically used for mogrify syntax and not convert syntax with respect to the output format.

Try

convert.exe 1.jpg -compress LZW -depth 8 1.tiff

You might want to post an example of 1.jpg. Are you sure it is true color and not grayscale.

[forenhopper]

@fmw42

thx for fast reply.

They are grayscale but i want to tranform to RGB.

[forenhopper]

ok thx for the Link above. -type TrueColor solved my Problem.