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Wrong JPEG subsampling setting #52

alessandrofrancesconi opened this Issue Nov 24, 2013 · 0 comments

1 participant


(from Gimp Plugin repository)

I just wanted to report a bug that causes BIMP to use the wrong subsampling setting when converting to jpg.
After much trial-and-error, I am certain that this is, "what Bimp setting corresponds to which Gimp setting":
1x1, 1x1, 1x1 (Quality) = 4:2:0 (chroma quartered)
2x1, 1x1, 1x1 (4:2:2) = 4:2:2 horizontal (chroma halved)
1x2, 1x1, 1x1 = 4:4:4 (Best quality)
2x2, 1x1, 1x1 (Small size) = 4:2:2 vertical (chroma halved)
As you can see, severe quality loss can happen if one is not aware of the bug.

@alessandrofrancesconi alessandrofrancesconi added a commit that referenced this issue Apr 21, 2014
@alessandrofrancesconi Pushed to 1.9
- Added watermark alignment buttons for top-center, center-left,
center-right, bottom-center (thanks to @Walt9Z)
- It's now possible to resize both dimension but keeping the aspect
ratio. In this case, the pixel width/height
are treated as maximum sizes for the resulting image. (issue #25)
(thanks to @Walt9Z)
- Resize and Crop manipulations are now treated as "normal priority"
steps. Originally they started first, now they follow
the original order given by the user in the GUI (issue #53)
- Added "tall" smartphone screen Crop presets (for devices like iPhone
- JPEG subsampling settings was wrong (issue #52)
- Updated Italian translation
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