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Morph-M Python - Creation and Deletion » History » Version 2

Serge Koudoro, 10/23/2009 03:52 PM

1 2 Serge Koudoro
h1. *Morph-M Python - Creation and Deletion*
2 1 Serge Koudoro
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h3{color:#8B0000}. +Creation...+
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Images can either be created by type and size.
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<pre><code class="ruby">
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im=createImage(dataCategory.dtScalar,scalarDataType.sdtUINT8)
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im.setSize(256,256)
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im.allocateImage()
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</code></pre>
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which type and size are this following value:
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    * *Type*: _sdtINT8, sdtINT16, sdtINT32, sdtINT64, sdtUINT8, sdtUINT16, sdtUINT32, sdtUINT64, sdtFloat, sdtDouble, sdtBIT, sdtOffset, sdtLabel, sdtSTR, sdtObject, sdtCompound, sdtList, sdtMap, sdtPair_.
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    * *size*: _dtScalar, dtAngular, dtComplex, dtPixel3, dtPixel4, dtOffsetList, dtPointer, dtArray, dtImage, dtNeighborhood, dtVariant, dtCVariant_. 
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h3{color:#8B0000}. +Load from file...+
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Images can be loaded from a file, and can be write to a file
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<pre><code class="ruby">
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im2=pngFileRead("foo.png")
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im2=bmpFileRead("foo.bmp")
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im2=csvFileRead("foo.csv")
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im2=jpegFileRead("foo.jpg")
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pngFileWrite(im2,"foo.png")
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bmpFileWrite(im2,"foo.bmp")
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csvFileWrite(im2,"foo.csv")
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jpegFileWrite(im2,"foo.jpg")
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#generic function
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im2=fileRead("foo.png")
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fileWrite(im2, "foo.jpg")
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</code></pre>
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PNG is the best supported format.
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h3{color:#8B0000}. +Features...+
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Images are Python objects and as such are reference-counted and automatically destroyed when leaving the scope. This code does not leak memory:
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<pre><code class="ruby">
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while 1:
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im=pngFileRead("hop.png")
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</code></pre>
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Images are passed and copied by reference:
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<pre><code class="ruby">
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im2=im1
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ImSetConstant(im1,255)
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for pixel in im2:
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print pixel
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</code></pre>
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The second image is also put to 255. A new image can be created by using getSame and ImCopy:
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<pre><code class="ruby">
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im2=im1.getSame()                   #or im2=ImCreateSame(im1)
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im3=im1.ImCreateSame(im1, "UINT16") #changing image type
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ImCopy(im1,im2)
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ImSetConstant(im1,255)
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for pixel in im2:
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print pixel
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</code></pre>
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The second image will have kept its values even while the first is uniformally set to 255.