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What you call unmapped pixels are considerated "holes" in the rotated image. In image computing (such as analysis, rendering, etc.) a rotation is a manipulation of an image A in order to obtain an image A' so that it is a rotated version of θ degrees (or radians). The simplest way to achieve this, and I guess this is the method you applied, is to consider a ...


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i've found my way... we can load images and show different text formats by UIRichText... also you can push unicode texts... example code is: auto text = cocos2d::ui::RichText::create(); const auto font = std::string("fonts/FinalFonts/Berlin.ttf"); text->pushBackElement(ui::RichElementCustomNode::create(1995, Color3B(255, 255, 255), 255, ...


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Basically, the idea is to spread out the error to adjacent pixels. Let's take a grayscale image for simplicity (for RGB you'd just do the same thing for each channel), and say you had an 8-bit pixel value (255 max) of 116 that you want to scale to 4-bits. The closest 4-bit color (15 max) would be 116*15/255, which rounds to 7. This, expanded back to 8-bits ...



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