Chapter 17 finished

17-image/README.md

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+# Pillow
+`pip install pillow`
+<pre>
+from PIL import ImageColor
+from PIL import Image
+</pre>
+
+

17-image/drawAndText.py

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+from PIL import Image, ImageDraw
+im = Image.new('RGBA', (200, 200), 'white')
+draw = ImageDraw.Draw(im)
+draw.line([(0, 0), (199, 0), (199, 199), (0, 199), (0, 0)], fill='black')
+draw.rectangle((20, 30, 60, 60), fill='blue')
+draw.ellipse((120, 30, 160, 60), fill='red')
+draw.polygon(((57, 87), (79, 62), (94, 85), (120, 90), (103, 113)),
+fill='brown')
+for i in range(100, 200, 10):
+    draw.line([(i, 0), (200, i - 100)], fill='green')
+
+im.save('drawing.png')
+from PIL import ImageFont
+import os
+im = Image.new('RGBA', (200, 200), 'white')
+draw = ImageDraw.Draw(im)
+draw.text((20, 150), 'Hello', fill='purple')
+fontsFolder = 'C:/Windows/Fonts'
+arialFont = ImageFont.truetype(os.path.join(fontsFolder, 'arial.ttf'), 32)
+draw.text((100, 150), 'Howdy', fill='gray', font=arialFont)
+im.save('text.png')

17-image/imageOp.py

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+catIm = Image.open('zophie.png')
+width, height = catIm.size
+catIm.save('zophie.jpg')
+im = Image.new('RGBA', (100,200), 'purple')
+im.save('purpleImage.png')
+im2 = Image.new('RGBA', (20, 20))
+im2.save('transparentImage.png')
+croppedIm = catIm.crop((335,345, 565,560))
+croppedIm.save('cropped.png')
+catCopyIm = catIm.copy()
+facedIm = catIm.crop((335,345, 565,560))
+faceIm = catIm.crop((335,345, 565,560))
+catCopyIm.paste(faceIm, (0, 0))
+catCopyIm.paste(faceIm, (400, 500))
+catCopyIm.save('pasted.png')
+w, h = catIm.size
+fw, fh = faceIm.size
+catCopyTwo = catIm.copy()
+for left in range(0, w, fw):
+    for top in range(0, h, fh):
+            print(left, top)
+            catCopyTwo.paste(faceIm, (left, top))
+
+catCopyTwo.save('tiled.png')
+qIm = catIm.resize((int(w/2), int(h/2)))
+
+qIm.save('quartersized.png')
+sveltedIm = catIm.resize((w, h+300))
+
+sveltedIm.save('svelte.png')
+catIm.rotate(90).save('rotated90.png')
+catIm.rotate(180).save('rotated180.png')
+catIm.rotate(270).save('rotated270.png')
+catIm.rotate(6).save('rotated6.png')
+catIm.rotate(6, expand=True).save('rotated6_expanded.png')
+im = Image.new('RGBA', (100, 100))
+im.getpixel((0,0))
+(0, 0, 0, 0)
+for x in range(100):
+    for y in range(50):
+            im.putpixel((x, y), (210, 210, 210))
+
+for x in range(100):
+    for y in range(50, 100):
+            im.putpixel((x, y), ImageColor.getcolor('darkgray', 'RGBA'))
+
+
+from PIL import ImageColor
+for x in range(100):
+    for y in range(50, 100):
+            im.putpixel((x, y), ImageColor.getcolor('darkgray', 'RGBA'))
+
+im.save('putPixel.png')

17-image/png2jpg.py

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+from PIL import Image
+
+catIm = Image.open('zophie.png')
+catIm.save('zophie.jpg')

17-image/resizeAndAddLogo.py

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+#! python3
+# resizeAndAddLogo.py - Resizes all images in current working directory to fit
+# in a 300x300 square, and adds catlogo.png to the lower-right corner.
+
+import os
+from PIL import Image
+
+SQUARE_FIT_SIZE = 300
+LOGO_FILENAME = 'catlogo.png'
+
+logoIm = Image.open(LOGO_FILENAME)
+logoWidth, logoHeight = logoIm.size
+
+os.makedirs('withLogo', exist_ok=True)
+# Loop over all files in the working directory.
+for filename in os.listdir('.'):
+    if not (filename.endswith('.png') or filename.endswith('.jpg')) \
+       or filename == LOGO_FILENAME:
+        continue # skip non-image files and the logo file itself
+
+    im = Image.open(filename)
+    width, height = im.size
+
+    # Check if image needs to be resized.
+    if width > SQUARE_FIT_SIZE and height > SQUARE_FIT_SIZE:
+        # Calculate the new width and height to resize to.
+        if width > height:
+            height = int((SQUARE_FIT_SIZE / width) * height)
+            width = SQUARE_FIT_SIZE
+        else:
+            width = int((SQUARE_FIT_SIZE / height) * width)
+            height = SQUARE_FIT_SIZE
+
+        # Resize the image.
+        print('Resizing %s...' % (filename))
+        im = im.resize((width, height))
+
+    # Add logo.
+    print('Adding logo to %s...' % (filename))
+    im.paste(logoIm, (width - logoWidth, height - logoHeight), logoIm)
+
+    # Save changes.
+    im.save(os.path.join('withLogo', filename))