[Python basic series] one small program per day -01

List of articles

• • subject
  • Reference code
  • The code analysis

subject

The first 0000 topic
Put your QQ Head portrait （ Or Weibo / Letterhead ） Add a red number to the top right corner , It is similar to the prompt effect of the amount of unread information on wechat . Similar to the effect in the picture .

Reference code

from PIL import Image, ImageDraw, ImageColor, ImageFont
def add_num(img):
draw = ImageDraw.Draw(img)
font1 = ImageFont.truetype('/System/Library/Fonts/Apple Symbols.ttf', size=40)
fillcolor = ImageColor.colormap.get('red')
width, height = img.size
draw.text((width-30, 0), '1', font=font1, fill=fillcolor)
# On the new object (width-30, 0) Red at the beginning “1”
img.save('result.jpg', 'jpeg')
return 0
if __name__ == '__main__':
image = Image.open('test.jpg')
add_num(image)

The code analysis

PIL（Python Image Library）,Python Image processing standard library of the platform .

• Open the picture Image.open()
• Save the picture img.save()
• Get the picture size width, height = img.size

ImageDraw The module provides a simple representation of the image object 2D draw .

• establish Draw object draw = ImageDraw.Draw(img)

ImageFont Modular truetype function

• Usage method ：ImageFont.truetype(file,size)
• effect ： Load one TrueType perhaps OpenType The font file , And create a font object . This function loads a font object from the specified file , And create a font object for the font of the specified size .

ImageColor

• PIL.ImageColor Contains two functions that convert strings to color values getrgb() And getcolor().
• The color name is passed in as a parameter , Allowed names are defined in PIL.ImageColor.colormap in