Added pythonic demos

.gitignore

@@ -0,0 +1,10 @@
+*.o
+*.pyc
+build/
+dist/
+.DS_Store
+.hg/
+.hgignore
+.idea/
+.project/
+Demos/ignores/

Demos/README.md

@@ -0,0 +1,10 @@
+# Resources about PIL
+
+PIL Handbook
+http://www.pythonware.com/library/pil/handbook/index.htm
+
+python 简单图像处理 series, ￥lan￥
+http://www.cnblogs.com/xianglan/archive/2010/12/25/1916953.html
+
+PIL 学习笔记 series, Neil Chen
+http://www.cnblogs.com/RChen/archive/2007/03/31/pil_1.html

Demos/access_pixsel/access_pixsel.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env python
+import os
+PWD = os.path.dirname(os.path.realpath(__file__))
+parent_path = os.path.dirname(PWD)
+
+import Image
+
+file_path = os.path.join(parent_path, "image_resources", "captcha.jpg")
+
+im = Image.open(fp = file_path)
+im = im.draft("L", im.size)
+w, h = im.size[0], im.size[1]
+pixsels = im.load()
+
+print "width:", w
+print "high:", h
+print "white(255) ~ black(0):", pixsels[0, 0]
+
+def print_im(im, w = None, h = None):
+    if isinstance(im, Image.Image):
+        w, h = im.size[0], im.size[1]
+        pixsels = im.load()
+    else:
+        pixsels = im
+
+    for x in xrange(w):
+        for y in xrange(h):
+
+            if pixsels[x, y] > 128:
+                print " ",
+            else:
+                print "1",
+        print
+
+print_im(im, w, h)

Demos/crop/crop.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python
+import os
+PWD = os.path.dirname(os.path.realpath(__file__))
+parent_path = os.path.dirname(PWD)
+
+import Image
+
+file_path = os.path.join(parent_path, "image_resources", "l_hires.jpg")
+
+im = Image.open(fp = file_path)
+
+left_upper_x, left_upper_y = 400, 100
+right_lower_x, right_lower_y = 700, 450
+box = (left_upper_x, left_upper_y, right_lower_x, right_lower_y)
+
+region = im.crop(box)
+
+new_filename = "x".join([str(i) for i in box]) + ".jpg"
+region.save(new_filename)

Demos/cutting_pasting_and_merging/cutting_pasting_and_merging.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python
+"""
+copy image
+"""
+import os
+PWD = os.path.dirname(os.path.realpath(__file__))
+parent_path = os.path.dirname(PWD)
+
+import Image
+
+file_path = os.path.join(parent_path, "image_resources", "l_hires.jpg")
+im = Image.open(fp = file_path)
+
+left_upper_x, left_upper_y = 10, 10
+right_lower_x, right_lower_y = 50, 50
+box = (left_upper_x, left_upper_y, right_lower_x, right_lower_y)
+
+region = im.crop(box)
+
+region = region.transpose(Image.ROTATE_90)
+im.paste(region, box)
+
+new_filename = "C-c-C-v-left" + ".jpg"
+im.save(new_filename)

Demos/draw_line/draw_line.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python
+import Image
+import ImageDraw
+
+BLACK = 0
+WHITE = 255
+
+
+canvas_w, canvas_h = 100, 100
+im = Image.new(mode = "L", size = (canvas_w, canvas_h), color = WHITE)
+
+draw = ImageDraw.Draw(im = im)
+
+left_top_x, left_top_y = 10, 10
+right_bottom_x, right_bottom_y = 30, 100
+box = (left_top_x, left_top_y, right_bottom_x, right_bottom_y)
+
+draw.line(xy = box, fill = BLACK, width = 1)
+
+im.save("draw_line.bmp")

Demos/draw_points/draw_points.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python
+import Image
+import ImageDraw
+
+
+BLACK = 0
+WHITE = 255
+
+
+canvas_w, canvas_h = 100, 100
+im = Image.new(mode = "L", size = (canvas_w, canvas_h), color = WHITE)
+
+draw = ImageDraw.Draw(im = im)
+
+p1_x, p1_y = 10, 10
+p2_x, p2_y = 15, 15
+p3_x, p3_y = 20, 10
+
+xy = (p1_x, p1_y)
+# or
+# xy = (p1_x, p1_y, p2_x, p2_y, p3_x, p3_y)
+
+
+fill = "#000"
+
+draw.point(xy, fill)
+
+im.save("draw_points.bmp")

Demos/draw_rectangle/draw_rectangle.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python
+import Image
+import ImageDraw
+
+BLACK = 0
+WHITE = 255
+
+
+canvas_w, canvas_h = 100, 100
+im = Image.new(mode = "L", size = (canvas_w, canvas_h), color = WHITE)
+
+draw = ImageDraw.Draw(im = im)
+
+left_top_x, left_top_y = 10, 10
+right_bottom_x, right_bottom_y = 30, 100
+box = (left_top_x, left_top_y, right_bottom_x, right_bottom_y)
+
+draw.rectangle(xy = box, fill = BLACK, outline = None)
+
+im.save("draw_rectangle.bmp")

Demos/draw_text/draw_text.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python
+from PIL import Image, ImageDraw, ImageFont
+import sys
+
+BLACK = 0
+WHITE = 255
+
+canvas_w, canvas_h = 100, 100
+im = Image.new(mode = "L", size = (canvas_w, canvas_h), color = WHITE)
+
+draw = ImageDraw.Draw(im = im)
+
+left_top_x, left_top_y = 10, 10
+begin = left_top_x, left_top_y
+
+text = "hello world"
+fill = "#000"
+
+if sys.platform == "darwin":
+    filename = "/Library/Fonts/Microsoft/Times New Roman Bold.ttf"
+elif sys.platform == "win32":
+    #filename = "C:/Windows/Fonts/timesbd.ttf"
+    filename = "timesbd.ttf"
+else:
+    raise Exception
+font_size = 14
+font = ImageFont.truetype(filename = filename, size = font_size)
+
+draw.text(xy = begin, text = text, fill = fill, font = font)
+
+im.save("draw_text.bmp")

Demos/flip/flip.py

@@ -0,0 +1,17 @@
+#!/usr/bin/env python
+import os
+PWD = os.path.dirname(os.path.realpath(__file__))
+parent_path = os.path.dirname(PWD)
+
+import Image
+
+file_path = os.path.join(parent_path, "image_resources", "captcha.jpg")
+im = Image.open(fp = file_path)
+
+#new_im = im.transpose(Image.FLIP_LEFT_RIGHT)
+#new_filename = os.path.splitext(filepath)[0] + "flip_left_right" + ".jpg"
+
+new_im = im.transpose(Image.FLIP_TOP_BOTTOM)
+new_filename = os.path.splitext(os.path.basename(file_path))[0] + '-' + "flip_top_bottom" + ".jpg"
+
+new_im.save(new_filename)

Demos/grayscale/grayscale.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+import os
+PWD = os.path.dirname(os.path.realpath(__file__))
+parent_path = os.path.dirname(PWD)
+
+import Image
+
+file_path = os.path.join(parent_path, "image_resources", "l_hires.jpg")
+
+im = Image.open(fp = file_path)
+
+# "L" (8-bit pixels, black and white)
+# http://www.pythonware.com/library/pil/handbook/concepts.htm
+new_im = im.convert("L")
+new_file_name = os.path.splitext(os.path.basename(file_path))[0]
+new_file_name = new_file_name + '-' + 'grayscale' + '.bmp'
+new_im.save(new_file_name)
+

Demos/histogram/histogram.py

@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+import os
+PWD = os.path.dirname(os.path.realpath(__file__))
+parent_path = os.path.dirname(PWD)
+
+import Image, ImageDraw
+
+file_path = os.path.join(parent_path, "image_resources", "captcha.jpg")
+
+BLACK = 0
+WHITE = 255
+# white(255) ~ black(0)
+
+im = Image.open(fp = file_path)
+w, h = im.size[0], im.size[1]
+
+print "width:", w
+print "high:", h
+
+
+im = im.draft("L", im.size)
+
+pixsels = im.load()
+
+
+for x in xrange(w):
+    for y in xrange(h):
+        if pixsels[x, y] > 128:
+            pixsels[x, y] = WHITE
+        else:
+            pixsels[x, y] = BLACK
+
+
+counts = []
+for x in xrange(w):
+    count = len([1 for y in xrange(h)
+                if pixsels[x, y] is BLACK])
+
+    counts.append(count)
+
+
+hist_im = Image.new(mode = "L", size = (w, h), color = WHITE)
+draw = ImageDraw.Draw(hist_im)
+h_step = h / max(counts)
+
+for x in xrange(w):
+    left_top_x, left_top_y = x, h - counts[x] * h_step
+    right_bottom_x, right_bottom_y = x + 1, h
+    box = (left_top_x, left_top_y, right_bottom_x, right_bottom_y)
+    draw.rectangle(xy = box, fill = BLACK)
+
+new_file_name = os.path.splitext(os.path.basename(file_path))[0]
+new_file_name = new_file_name + '-' + 'histogram' + '.bmp'
+
+hist_im.save(new_file_name)

Demos/image_info/get_img_info.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+import os
+PWD = os.path.dirname(os.path.realpath(__file__))
+parent_path = os.path.dirname(PWD)
+
+import Image
+
+file_path = os.path.join(parent_path, "image_resources", "captcha.jpg")
+
+im = Image.open(fp = file_path)
+w, h = im.size[0], im.size[1]
+
+print "format:", type(im.format), im.format
+print "info:", type(im.info), im.info
+print "mode:", type(im.mode), im.mode
+print "size:", type(im.size), im.size
+print "bands:", type(im.getbands()), im.getbands()
+print "histogram:", type(im.histogram())
+
+data = im.getdata()
+print "getdata:", type(data)
+assert len(im.getdata()) == w * h

Demos/rotate/rotate.py

@@ -0,0 +1,15 @@
+#!/usr/bin/env python
+import os
+PWD = os.path.dirname(os.path.realpath(__file__))
+parent_path = os.path.dirname(PWD)
+
+import Image
+
+file_path = os.path.join(parent_path, "image_resources", "captcha.jpg")
+
+im = Image.open(fp = file_path)
+degress = 90
+new_im = im.rotate(degress)
+
+new_filename = os.path.splitext(os.path.basename(file_path))[0] + "-rotate-" + str(degress) + ".jpg"
+new_im.save(new_filename)

Demos/thumbnail/create_thumbnail.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python
+import os
+PWD = os.path.dirname(os.path.realpath(__file__))
+parent_path = os.path.dirname(PWD)
+
+import Image
+
+file_path = os.path.join(parent_path, "image_resources", 'l_hires.jpg')
+im = Image.open(fp = file_path)
+
+width, height = im.size[0], im.size[1]
+new_size = (width/8, height/8)
+
+im.thumbnail(new_size)
+
+new_filename= "x".join([str(i) for i in new_size])
+new_filename = os.path.splitext(os.path.basename(file_path))[0] + '-' + new_filename + ".jpg"
+new_file_path = os.path.join(PWD, new_filename)
+
+im.save(new_filename)