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[SGI] Save uncompressed SGI/BW/RGB/RGBA files

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Save feature added to SgiImagePlugin.py, uncompressed method only
This commit is contained in:
Mickael B 2016-09-17 04:03:40 -04:00 committed by wiredfool
parent 41c97af15c
commit 597ab45d4d
1 changed files with 78 additions and 2 deletions
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80
PIL/SgiImagePlugin.py
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@ -7,9 +7,12 @@
# See "The SGI Image File Format (Draft version 0.97)", Paul Haeberli.
# <ftp://ftp.sgi.com/graphics/SGIIMAGESPEC>
#
#
# History:
# 2016-16-10 mb Add save method without compression
# 1995-09-10 fl Created
#
# Copyright (c) 2016 by Mickael Bonfill.
# Copyright (c) 2008 by Karsten Hiddemann.
# Copyright (c) 1997 by Secret Labs AB.
# Copyright (c) 1995 by Fredrik Lundh.
@ -19,8 +22,10 @@
from PIL import Image, ImageFile, _binary
import struct
import os
__version__ = "0.2"
__version__ = "0.3"
i8 = _binary.i8
i16 = _binary.i16be
@ -76,12 +81,83 @@ class SgiImageFile(ImageFile.ImageFile):
elif compression == 1:
raise ValueError("SGI RLE encoding not supported")
def _save(im, fp, filename):
if im.mode != "RGB" and im.mode != "RGBA" and im.mode != "L":
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)
# Define the file as SGI File Format
magicNumber = 474
# Run-Length Encoding Compression - Unsupported at this time
rle = 0
# Byte-per-pixel precision, 1 = 8bits per pixel
bpc = 1
# Number of dimensions (x,y,z)
dim = 3
# X Dimension = width / Y Dimension = height
x, y = im.size
if im.mode == "L" and y == 1:
dim = 1
elif im.mode == "L":
dim = 2
# Z Dimension: Number of channels
z = len(im.mode)
if dim == 1 or dim == 2:
z = 1
# Minimum Byte value
pinmin = 0
# Maximum Byte value (255 = 8bits per pixel)
pinmax = 255
# Image name (79 characters max)
imgName = os.path.splitext(os.path.basename(filename))[0][0:78]
# Standard representation of pixel in the file
colormap = 0
channels = []
for channelIndex in range(0, z):
channelData = list(im.getdata(channelIndex))
channels.append(channelData)
fp.write(struct.pack('>h', magicNumber))
fp.write(struct.pack('c', chr(rle)))
fp.write(struct.pack('c', chr(bpc)))
fp.write(struct.pack('>H', dim))
fp.write(struct.pack('>H', x))
fp.write(struct.pack('>H', y))
fp.write(struct.pack('>H', z))
fp.write(struct.pack('>l', pinmin))
fp.write(struct.pack('>l', pinmax))
for i in range(0, 4):
fp.write(struct.pack('c', chr(0)))
for c in imgName:
fp.write(struct.pack('c', c))
fp.write(struct.pack('c', chr(0)))
if len(imgName) < 78:
charIndex = len(imgName)
for charIndex in range(len(imgName), 79):
fp.write(struct.pack('c', chr(0)))
fp.write(struct.pack('>l', colormap))
for i in range(0, 404):
fp.write(struct.pack('c', chr(0)))
for zChannel in range(0, z):
dIndex = 0
for yPos in range(0, y):
for xPos in range(0, x):
fp.write(struct.pack('c', chr(channels[zChannel][dIndex])))
dIndex += 1
fp.close()
#
# registry
Image.register_open(SgiImageFile.format, SgiImageFile, _accept)
Image.register_save(SgiImageFile.format, _save)
Image.register_mime(SgiImageFile.format, "image/sgi")
Image.register_mime(SgiImageFile.format, "image/rgb")
Image.register_extension(SgiImageFile.format, ".bw")
Image.register_extension(SgiImageFile.format, ".rgb")
Image.register_extension(SgiImageFile.format, ".rgba")
Image.register_extension(SgiImageFile.format, ".sgi")
# End of file