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POImage with image mask
 

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    <p>I have a pdf document which has as background a colored(red rgb) rectangle and after that it is applied an image(rgb image) which contains another image as mask(monochrome).</p> <p>I cannot find the correct operator to apply on that with cairo library.</p> <p>Could you give some hints how should i do that?</p> <p>I have done the following: </p> <pre><code>//load the image from file image = cairo_image_surface_create_from_png(".\image.png"); image_width = cairo_image_surface_get_width(image); image_height = cairo_image_surface_get_height(image); cairo_set_source_surface(cr, wndImage, 0, 0); //create a rectangle and color with red cairo_rectangle(cr, 0, 0, w, h); cairo_set_source_rgb(cr, 1.0, 0.0, 0.0); cairo_fill(cr); cairo_paint(cr); //load the mask from file and applied the image and mask to the destination mask = cairo_image_surface_create_from_png(".\mask.png"); cairo_set_source_surface(cr, image, 0, 0); cairo_mask_surface(cr, mask, 0, 0); cairo_paint (cr); </code></pre> <p>The pdf contains that following:</p> <pre><code>5 0 obj &lt;&lt; /ImageMask true /Type/XObject/Subtype/Image /BitsPerComponent 1 /Width 2487 /Height 3512 /ColorSpace/DeviceGray /DecodeParms&lt;&lt;/Columns 2487/K -1&gt;&gt;/Filter/CCITTFaxDecode /Length 17518&gt;&gt; 6 0 obj &lt;&lt; /Mask 5 0 R /Type/XObject/Subtype/Image /BitsPerComponent 8 /Width 1244 /Height 1756 /ColorSpace /DeviceRGB /Filter/DCTDecode /Length 162581&gt;&gt; 7 0 obj &lt;&lt; /Length 107&gt;&gt; stream 1 0 0 rg 0 -3.12 595 846 re f q 597.12 0 0 842.88 0 0 cm /I2 Do Q 0 g 0 G 0 Tr 0 Tc 0 Tw 100 Tz 1 w [] 0 d endstream endobj </code></pre>
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      1. VTUpMod
    1. COWhat have you already tried?
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      1. USGijs Overvliet
    2. COHow can an RGB image contain a monochrome mask?
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      1. USUli Schlachter
    3. CO@GijsOvervliet, i have updated the query, please check.
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