Python如何将jpg图像修改大小并转换为png

import os
import PIL.Image as Image
def changeJpgToPng(w, h, path):
    # 修改图像大小
    image = Image.open(path)
    image = image.resize((w, h), Image.ANTIALIAS)
    # 将jpg转换为png
    png_name = str(path)[0:-len('.jpg')] + '_min.png'
    image.save(png_name)
    print(png_name)
    # 去白底
    image = image.convert('RGBA')
    img_w, img_h = image.size
    color_white = (255, 255, 255, 255)
    for j in range(img_h):
        for i in range(img_w):
            pos = (i, j)
            color_now = image.getpixel(pos)
            if color_now == color_white:
                # 透明度置为0
                color_now = color_now[:-1] + (0,)
                image.putpixel(pos, color_now)
    image.save(png_name)
if __name__ == '__main__':
    t_w = 300
    t_h = 150
    dic = os.listdir('image')
    for d in dic:
        if d.count('.jpg') > 0:
            changeJpgToPng(t_w, t_h, 'image/' + d)

# python:批量实现jpg图片修改大小并转换为png
# author：zhou jinxing
import os
import PIL.Image as Image
def changeJpgToPng(w, h,srcPath,dstPath):
    # 修改图像大小
    image = Image.open(srcPath)
    image = image.resize((w, h), Image.ANTIALIAS)
    # 将jpg转换为png
    png_name = str(dstPath)[0:-len('.jpg')] + '.png'
    image.save(png_name)
    print(png_name)
    # 去白底
    #image = image.convert('RGBA')
    image = image.convert('RGB')
    img_w, img_h = image.size
    #color_white = (255, 255, 255, 255)
    color_white = (255, 255, 255)
    for j in range(img_h):
        for i in range(img_w):
            pos = (i, j)
            color_now = image.getpixel(pos)
            if color_now == color_white:
                # 透明度置为0
                color_now = color_now[:-1] + (0,)
                image.putpixel(pos, color_now)
    image.save(png_name)
if __name__ == '__main__':
    t_w = 1242
    t_h = 375
    #srcPath = '/workspace/tlt-experiments/data_fire/image_2_jpg/'
    #dstPath = '/workspace/tlt-experiments/data_fire/image_2_png/'
    srcPath = '/workspace/tlt-experiments/data_fire/012/training/image_2/'
    dstPath = '/workspace/tlt-experiments/data_fire/012/training/image_2_png/'    
#    filename_list = os.listdir('/workspace/tlt-experiments/data_fire/image_2_jpg')
#    for d in dic:
#        if d.count('.jpg') > 0:
#            changeJpgToPng(t_w, t_h, 'image/' + d)
    print("开始转换...")
    filename_list = os.listdir('/workspace/tlt-experiments/data_fire/012/training/image_2')
    for d in filename_list:
        if d.count('.png') > 0:
            changeJpgToPng(t_w, t_h,srcPath + d,dstPath + d)
        pass
    print("完成了...")