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Adaptive resampling method for images (Fix #174)

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When loading an image for thumbnails and previews, the resampling method is now determined by the size of the original image. Now low resolution images use "nearest neighbor" sampling while higher resolution images continue to use "bilinear" sampling.
This commit is contained in:
Travis Abendshien
2024-05-18 17:57:28 -07:00
parent 9d7609a8e5
commit 699ecd367c
1 changed files with 10 additions and 2 deletions
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12
tagstudio/src/qt/widgets/thumb_renderer.py
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@@ -107,7 +107,7 @@ class ThumbRenderer(QObject):
adj_size = math.ceil(max(base_size[0], base_size[1]) * pixel_ratio)
if is_loading:
final = ThumbRenderer.thumb_loading_512.resize(
(adj_size, adj_size), resample=resampling_method
(adj_size, adj_size), resample=Image.Resampling.BILINEAR
)
qim = ImageQt.ImageQt(final)
pixmap = QPixmap.fromImage(qim)
@@ -163,7 +163,7 @@ class ThumbRenderer(QObject):
# No Rendered Thumbnail ========================================
else:
image = ThumbRenderer.thumb_file_default_512.resize(
(adj_size, adj_size), resample=resampling_method
(adj_size, adj_size), resample=Image.Resampling.BILINEAR
)
if not image:
@@ -181,6 +181,14 @@ class ThumbRenderer(QObject):
if update_on_ratio_change:
self.updated_ratio.emit(new_x / new_y)
resampling_method = (
Image.Resampling.NEAREST
if max(image.size[0], image.size[1])
< max(base_size[0], base_size[1])
else Image.Resampling.BILINEAR
)
image = image.resize((new_x, new_y), resample=resampling_method)
if gradient:
mask: Image.Image = ThumbRenderer.thumb_mask_512.resize(