Re: Compositing transparent png over image using Magick++ GraphicsMagick API

The JPEG format does not support transparency. Try saving as png instead.

On Tuesday, 28 January 2014, Dragan Jotanovic <[email protected]> wrote:

>  Hello,
>
> I am trying to compose png watermark with transparency using Magick++ API,
> but after saving, image the transparency is lost.
>
> The code I use is:
>
> Image source("source.jpg");Image watermark("watermark.png");
> source.composite(watermark, 0, 0, DissolveCompositeOp);
> source.write("destination.jpg");
>
>  I tried explicitly setting image type (of both source and watermark) to
> TrueColorMatteType, but no change, transparent color is still black
> instead of transparent.
>
> Does anyone know what else needs to be done in order to preserve
> transparency after composition?
>
>
> Dragan
>

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