python - 使用 PyPNG 模块创建填充图像

Question

如果没有 numpy 模块，我怎么能做到这一点？它绘制了一个 256x256 的白色正方形

rows = [[255 for element in xrange(4) for number_of_pixles in xrange(256)] for number_of_rows in xrange(256)]
import numpy # Using numpy is much faster
rows = numpy.zeros((256, 256 * 4), dtype = 'int')
rows[:] = 255
png_writer = png.Writer(width = 256, height = 256, alpha = 'RGBA')
png_writer.write(open('white_panel.png', 'wb'), rows)

Answer 1

您已经在创建一个没有 numpy 的正方形。所以只需使用它：

rows = [[255]* 4 * 256] * 256
png_writer = png.Writer(width=256, height=256, alpha='RGBA')
with open('white_panel.png', 'wb') img:
    png_writer.write(img, rows)