Recently when a PIL synthetic PNG image as a GIF, because of the need transparent background, so replace it method putpixel of a transparent background, but in the synthesis of GIF, images appear ghosting, the Internet to find a GIF relevant information: GIF related information that has instructions for processing frames of GIF, needs to be set in the header disposal disposal GIF image
Then we can see the PIL library definition files GifImagePlugin.py about the GIF
1 disposal = int(im.encoderinfo.get("disposal", 0)) 2 3 if transparent_color_exists or duration != 0 or disposal: 4 packed_flag = 1 if transparent_color_exists else 0 5 packed_flag |= disposal << 2 6 if not transparent_color_exists: 7 transparency = 0 8 9 fp.write( 10 b"!" 11 + o8(249) # extension intro 12 + o8(4) # length 13 + o8(packed_flag) # packed fields 14 + o16(duration) # duration 15 + o8(transparency) # transparency index 16 + o8(0)
One of the paragraphs of the definition of Disposal, if you do not set the property disposal when you save it defaults to 0, ie without using processing method, so each one PNG files are retained become the background, that is, we see the ghost, so we in the synthesis of GIF, disposal value needs to be set
Original:
The following is a transparent background PNG image code generation:
. 1 from the PIL Import Image 2 . 3 IMG = Image.open ( " dabai.gif " ) . 4 the try : . 5 In Flag = 0 . 6 the while True: . 7 # acquired per frame . 8 img.seek (In Flag) . 9 # save 10 img.save ( " pics / {}. PNG " .format (In Flag)) . 11 PIC = Image.open ( " pics / {}. PNG " .format (In Flag)) 12 is # conversion 13 = pic.convert PIC ( " the RGBA " ) 14 # replaced with a transparent background 15 Color = pic.getpixel ((0,0)) 16 for I in Range (pic.size [0]): . 17 for J in Range (PIC .size [. 1 ]): 18 is DOT = (I, J) . 19 RGBA = pic.getpixel (DOT) 20 is IF RGBA == Color: 21 is RGBA RGBA = [: -. 1] + (0,) 22 is pic.putpixel ( DOT, RGBA) 23 # save 24 pic.save("pics/{}.png".format(flag)) 25 flag +=1 26 except BaseException as e: 27 pass
GIF image synthesis:
. 1 # ! / Usr / bin / Python the env 2 # - * - Coding: UTF-. 8 - * - . 3 . 4 from the PIL Import Image . 5 Import OS . 6 photo_list = [] . 7 # gets saved PNG image . 8 pic_list = the os.listdir ( " pics / " ) . 9 # sort image List, to prevent the image confusion position 10 pic_list.sort (Key = the lambda X: int (X [: -. 4 ])) . 11 for K in pic_list: 12 is pic_p Image.open = ( " pics / {} ".format (K)) 13 is photo_list.append (pic_p) 14 # save image, Disposal 2 or 3 may be, but is not 0 or 1, remember, other custom untried 15 photo_list [0] .save ( " dabai_new. GIF " , SAVE_ALL = True, append_images photo_list = [. 1:], DURATION = 40, Transparency = 0, Loop = 0, = Disposal. 3)
After the composite image, and the background has become a ghost does not appear transparent
