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ignore 2% of pixels near edges and don't crop more than 10% per edge (#1044)

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* max crop and ignore edges

* make edge_bbox neater
This commit is contained in:
Alex Xu
2025-07-26 07:26:10 -07:00
committed by GitHub
parent 27296565a3
commit 06e2ee2968
2 changed files with 19 additions and 0 deletions
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4
kindlecomicconverter/image.py
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@@ -429,6 +429,10 @@ class ComicPage:
bbox = get_bbox_crop_margin(self.image, power, self.fill) bbox = get_bbox_crop_margin(self.image, power, self.fill)
if bbox: if bbox:
w, h = self.image.size
left, upper, right, lower = bbox
# don't crop more than 10% of image
bbox = (min(0.1*w, left), min(0.1*h, upper), max(0.9*w, right), max(0.9*h, lower))
self.maybeCrop(bbox, minimum) self.maybeCrop(bbox, minimum)
def cropInterPanelEmptySections(self, direction): def cropInterPanelEmptySections(self, direction):

15
kindlecomicconverter/page_number_crop_alg.py
View File

@@ -141,6 +141,21 @@ def get_bbox_crop_margin(img, power=1, background_color='white'):
''' '''
threshold = threshold_from_power(power) threshold = threshold_from_power(power)
bw_img = img.point(lambda p: 255 if p <= threshold else 0) bw_img = img.point(lambda p: 255 if p <= threshold else 0)
# ignore pixels near the edges
w, h = bw_img.size
edge_bbox = [
(0, 0, w, int(0.02 * h)),
(0, int(0.98 * h), w, h),
(0, 0, int(0.02 * w), h),
(int(0.98 * w), 0, w, h)
]
for box in edge_bbox:
edge = bw_img.crop(box)
h = edge.histogram()
imperfections = h[255] / (edge.height * edge.width)
if imperfections > 0 and imperfections < .02:
bw_img.paste(im=0, box=box)
return bw_img.getbbox() return bw_img.getbbox()