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se abrir o photshop e usar o background eraser, vai ver que ela apaga o background da layer atual, expondo o conteúdo da layer sujacente
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The Background Eraser tool erases pixels on a layer to transparency as you drag. You can erase the background while maintaining the edges of an object in the foreground. By specifying different sampling and tolerance options, you can control the range of the transparency and the sharpness of the boundaries.
https://helpx.adobe.com/photoshop/using/erasing-parts-image.html