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| import io | |
| import math | |
| from pathlib import Path | |
| from PIL import Image, ImageDraw | |
| def keep_ratio_resize(img, size, resample=Image.BILINEAR): | |
| if img.width > img.height: | |
| w = size | |
| h = int(img.height * size / img.width) | |
| else: | |
| h = size | |
| w = int(img.width * size / img.height) | |
| return img.resize((w, h), resample) | |
| def cubic_bezier(p1, p2, duration: int, frames: int): | |
| """ | |
| Args: | |
| p1: | |
| p2: | |
| duration: Total duration of the curve | |
| frames: | |
| Returns: | |
| """ | |
| x0, y0 = (0, 0) | |
| x1, y1 = p1 | |
| x2, y2 = p2 | |
| x3, y3 = (1, 1) | |
| def cal_y(t): | |
| return math.pow(1 - t, 3) * y0 + \ | |
| 3 * math.pow(1 - t, 2) * t * y1 + \ | |
| 3 * (1 - t) * math.pow(t, 2) * y2 + \ | |
| math.pow(t, 3) * y3 | |
| def cal_x(t): | |
| return math.pow(1 - t, 3) * x0 + \ | |
| 3 * math.pow(1 - t, 2) * t * x1 + \ | |
| 3 * (1 - t) * math.pow(t, 2) * x2 + \ | |
| math.pow(t, 3) * x3 | |
| res = [] | |
| for t in range(0, 1 * frames, duration): | |
| t = t / frames | |
| res.append((cal_x(t), cal_y(t))) | |
| res.append((1, 0)) | |
| return res | |
| def make_compare_gif( | |
| clean_img: Image.Image, | |
| src_img: Image.Image, | |
| max_side_length: int = 600, | |
| splitter_width: int = 5, | |
| splitter_color=(255, 203, 0, int(255 * 0.73)) | |
| ): | |
| if clean_img.size != src_img.size: | |
| clean_img = clean_img.resize(src_img.size, Image.BILINEAR) | |
| duration_per_frame = 20 | |
| num_frames = 50 | |
| # erase-in-out | |
| cubic_bezier_points = cubic_bezier((0.33, 0), (0.66, 1), 1, num_frames) | |
| cubic_bezier_points.reverse() | |
| max_side_length = min(max_side_length, max(clean_img.size)) | |
| src_img = keep_ratio_resize(src_img, max_side_length) | |
| clean_img = keep_ratio_resize(clean_img, max_side_length) | |
| width, height = src_img.size | |
| # Generate images to make Gif from right to left | |
| images = [] | |
| for i in range(num_frames): | |
| new_frame = Image.new('RGB', (width, height)) | |
| new_frame.paste(clean_img, (0, 0)) | |
| left = int(cubic_bezier_points[i][0] * width) | |
| cropped_src_img = src_img.crop((left, 0, width, height)) | |
| new_frame.paste(cropped_src_img, (left, 0, width, height)) | |
| if i != num_frames - 1: | |
| # draw a yellow splitter on the edge of the cropped image | |
| draw = ImageDraw.Draw(new_frame) | |
| draw.line([(left, 0), (left, height)], width=splitter_width, fill=splitter_color) | |
| images.append(new_frame) | |
| for i in range(10): | |
| images.append(src_img) | |
| cubic_bezier_points.reverse() | |
| # Generate images to make Gif from left to right | |
| for i in range(num_frames): | |
| new_frame = Image.new('RGB', (width, height)) | |
| new_frame.paste(src_img, (0, 0)) | |
| right = int(cubic_bezier_points[i][0] * width) | |
| cropped_src_img = clean_img.crop((0, 0, right, height)) | |
| new_frame.paste(cropped_src_img, (0, 0, right, height)) | |
| if i != num_frames - 1: | |
| # draw a yellow splitter on the edge of the cropped image | |
| draw = ImageDraw.Draw(new_frame) | |
| draw.line([(right, 0), (right, height)], width=splitter_width, fill=splitter_color) | |
| images.append(new_frame) | |
| images.append(clean_img) | |
| img_byte_arr = io.BytesIO() | |
| clean_img.save( | |
| img_byte_arr, | |
| format='GIF', | |
| save_all=True, | |
| include_color_table=True, | |
| append_images=images, | |
| optimize=False, | |
| duration=duration_per_frame, | |
| loop=0 | |
| ) | |
| return img_byte_arr.getvalue() | |