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Add comment to describe some useful variables

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Mickael B 2016-09-19 08:41:12 -04:00 committed by GitHub
parent ec8b66d2b5
commit 639b8518f8
1 changed files with 11 additions and 1 deletions
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12
PIL/SgiImagePlugin.py
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@ -86,23 +86,33 @@ def _save(im, fp, filename):
if im.mode != "RGB" and im.mode != "RGBA" and im.mode != "L": if im.mode != "RGB" and im.mode != "RGBA" and im.mode != "L":
raise ValueError("Unsupported SGI image mode") raise ValueError("Unsupported SGI image mode")
# Flip the image, since the origin of SGI file is the bottom-left corner
im = im.transpose(Image.FLIP_TOP_BOTTOM) im = im.transpose(Image.FLIP_TOP_BOTTOM)
# Define the file as SGI File Format
magicNumber = 474 magicNumber = 474
# Run-Length Encoding Compression - Unsupported at this time
rle = 0 rle = 0
# Byte-per-pixel precision, 1 = 8bits per pixel
bpc = 1 bpc = 1
# Number of dimensions (x,y,z)
dim = 3 dim = 3
# X Dimension = width / Y Dimension = height
x, y = im.size x, y = im.size
if im.mode == "L" and y == 1: if im.mode == "L" and y == 1:
dim = 1 dim = 1
elif im.mode == "L": elif im.mode == "L":
dim = 2 dim = 2
# Z Dimension: Number of channels
z = len(im.mode) z = len(im.mode)
if dim == 1 or dim == 2: if dim == 1 or dim == 2:
z = 1 z = 1
# Minimum Byte value
pinmin = 0 pinmin = 0
# Maximum Byte value (255 = 8bits per pixel)
pinmax = 255 pinmax = 255
# Image name (79 characters max)
imgName = os.path.splitext(os.path.basename(filename))[0][0:78] imgName = os.path.splitext(os.path.basename(filename))[0][0:78]
# Standard representation of pixel in the file
colormap = 0 colormap = 0
channels = [] channels = []
for channelIndex in range(0, z): for channelIndex in range(0, z):