remove alpha channel from TIFF

[Falcon]

Hi!
I am using MagickWand in PHP.

I create image and save in TIFF, but ImageMagick generate TIFF file with alpha channel.

Code: Select all

$mgck_wnd = NewMagickWand(); 
MagickNewImage( $mgck_wnd, WIDTH, HEIGHT );

// Draw
....

MagickSetImageColorspace( $mgck_wnd, MW_CMYKColorspace );
MagickSetImageType( $mgck_wnd, MW_ColorSeparationType );
MagickSetFormat( $mgck_wnd, 'TIFF' );
MagickEchoImageBlob( $mgck_wnd );

How generate TIFF file without alpha channel?

[anthony]

Generally by telling IM to turn off the "Matte" channel.

[Falcon]

Generally by telling IM to turn off the "Matte" channel.

I don't find functions in MagickWand for manipulation with channels.
How implement turning off "Matte" channel in code.

[roderikk]

Slightly related, to turn of alpha on the command line you run:

Code: Select all

convert input.tif -alpha off output_no_alpha.tif

[el_supremo]

This should do it:

Code: Select all

MagickSetImageAlphaChannel($mgck_wnd,MW_DeactivateAlphaChannel);

Pete