python-pillow/Pillow
1
1
Fork 0
mirror of https://github.com/python-pillow/Pillow.git synced 2025-08-14 01:04:45 +03:00
Code Issues Packages Projects Releases Wiki Activity

Added a quality resizing option for larger images

Browse Source
This commit is contained in:
392781 2020-08-19 17:50:25 -07:00
parent c48e87155f
commit 21315e5fb3
1 changed files with 12 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
src/PIL/Image.py
View File

@ -1272,7 +1272,7 @@ class Image:
return self.im.getband(band) return self.im.getband(band)
return self.im # could be abused return self.im # could be abused
def getdominantcolors(self, numcolors=3, maxiter=50, threshold=1): def getdominantcolors(self, numcolors=3, maxiter=50, threshold=1, quality=1.0):
""" """
Returns a list of dominant colors in an image using k-means Returns a list of dominant colors in an image using k-means
clustering. clustering.
@ -1284,10 +1284,20 @@ class Image:
:param threshold: Early stopping condition for the algorithm. :param threshold: Early stopping condition for the algorithm.
Higher values correspond with increased color differences. The Higher values correspond with increased color differences. The
default is set to 1 (corresponding to 1 pixel difference). default is set to 1 (corresponding to 1 pixel difference).
:param quality: Used for scaling an image to speed up calculations.
The default value is 1.0.
:returns: An unsorted list of pixel values. :returns: An unsorted list of pixel values.
""" """
if self.mode in ("F", "I", "L", "P"): # Checking if # of pixels is greater than a 1080p image.
if quality >= 1.0 and self.width * self.height >= 2073600:
recommended_quality = 300000 / self.width * self.height
message = "Lower quality recommended: {:.4}".format(recommended_quality)
warnings.warn(message)
elif quality != 1.0:
self.thumbnail((quality * self.width, quality * self.height))
if self.mode in ("F", "L", "I", "P"):
channels = 1 channels = 1
elif self.mode in ("RGB", "YCbCr", "LAB", "HSV"): elif self.mode in ("RGB", "YCbCr", "LAB", "HSV"):
channels = 3 channels = 3