PILPython图像处理模块.pptVIP

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2017-05-30 发布于北京
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PILPython图像处理模块.ppt

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Python Image LibraryPIL 10/13/05 PIL – What is it? Pythonic library for Loading and Saving images (diverse formats) Scaling, cropping, compositing, transforms, bands (e.g. alpha channel) Drawing text and basic shapes Akin to the program GIMP (*GIMP also has a nice python API called GIMP-Python) PIL - Examples Image resizing or format conversions Adding save/load support into your application * Font support also handy Chart generation (also see PIDDLE ) Thumbnail generation Watermarking or adding legend PIL API - Concepts Image – from file or newly created import Image im = Image.open(“vacation.jpeg) newIm = Image.new (“RGBA”, (640, 480), (255, 0, 0)) Format – file format print im.mode, im.size, im.format RGB (1024, 768) JPEG im.save (“vacation.png”) OR im.save (“vacation.png”, “PNG”) PIL API - Concepts Resampling Filters NEAREST, BILINEAR, BICUBIC, ANTIALIAS smallIm = im.resize ( (128, 128), Image.ANTIALIAS) Sizes – tuple of width and height Bounding boxes – tuples of x1, y1, x2, y2 0,0 is always upper left PIL API - Concepts Mode – gray scale “L”, color “RGBA” “RGB”, etc. 1 (1-bit pixels, black and white, stored with one pixel per byte) L (8-bit pixels, black and white) P (8-bit pixels, mapped to any other mode using a colour palette) RGB (3x8-bit pixels, true colour) RGBA (4x8-bit pixels, true colour with transparency mask) CMYK (4x8-bit pixels, colour separation) YCbCr (3x8-bit pixels, colour video format) I (32-bit integer pixels) F (32-bit floating point pixels) Color – specified as 32bit value, tuple, or string myColor = (255, 0, 0, 128) # full red, with 50% alpha myColor = 0x7f0000ff # full red, with 50% alpha myColor = “#00ff00” # web color myColor = “rgb (75%, 0%, 0%)” myColor = “hsl (0, 100%, 50%)” PIL API - Concepts Bands – the separate color channels bands = im.split () rIm = bands [0] aIm = bands [3] remadeImage = Image.merge (“RGBA”, (rIm, gIm, bIm, aIm)) grayscaleIm = Image.open (“myAlpha.gif”) remadeImage = myImage.putalph