emcconville
2015-02-14 00:00:14
Python's wand library offers a unique crop alternative. Using wand.image.Image[left:right, top:bottom] can sub-slice a new virtual pixel image.
from wand.image import Image
with Image(filename="big_image.jpg") as img:
i = 0
for h in range(0, img.height, 256):
for w in range(0, img.width, 256):
w_end = w + 256
h_end = h + 256
with img[w:w_end, h:h_end] as chunk:
chunk.save(filename='tiles_{0}.jpg'.format(i))
i += 1
The above will generate many tile images that match the +repage option from:
convert -crop 256x256 +repage big_image.jpg tiles_%d.jpg
Thank you @emcconville ... and if I would like to have line and clone place in the tile name ? something like
chunk.save(filename=myfilename+'tiles_'+chr(h)+'_'+chr(w)+'.jpg'.format(i))I guess ? But not like, I've got an error ...Yep. Just need to revisit some string formatting. Like:
"{}_tiles_{}_{}.jpg".format(myfilename, h, w), but that's up to you