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The right mouse button to adjust brightness, contr
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To adjust the brightness and contrast of the picture by the right mouse button. There are scanners code. Adjust the contrast, brightness code is very simple. From site VOID CScanToDocDlg::BrightAndContrast(HBITMAP hBitmap, INT bright, INT contrast, BYTE threshold) { FLOAT cv = contrast <= -255? -1.0f : contrast / 255.0f; if (contrast > 0 && contrast < 255) cv = 1.0f / (1.0f - cv) - 1.0f; BYTE values[256]; for (INT i = 0; i < 256; i ++) { INT v = contrast > 0? CheckValue(i + bright) : i; if (contrast >= 255) v = v >= threshold? 255 : 0; else v = CheckValue(v + (INT)((v - threshold) * cv + 0.5f)); values[i] = contrast < 0? CheckValue(v + bright) : v; } BITMAP bm; GetObject(hBitmap, sizeof(BITMAP), &b
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