https://bugs.kde.org/show_bug.cgi?id=366477
Bug ID: 366477
Summary: Gwenview save TIFF-images without compression
Product: gwenview
Version: Other (add details in bug description)
Platform: Kubuntu Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: gwenview-bugs-n...@kde.org
Reporter: fuc...@ukr.net
CC: myr...@kde.org
When you look through you images, you sometimes want to change rotation (e.g.
scanned landscape document). This process is very simple with Gwenview: make
your changes and press "Save" button. But there is a big problem with images in
TIF format.
Black and white (binary) image in TIFF-format with LZW compression has a very
small size. This is preferred format for scanning documents, because a disk
space is saving tremendously. But Gwenview ignores the compression type of
original TIFF-image and save this file type without any compression at all.
Here is mediainfo output: (I've not found <monospace> tag, sorry)
$ mediainfo ./*
General
Complete name : ./OriginalWithLZW.tif
Format : TIFF
File size : 52.5 KiB
Image
Format : LZW
Width : 3 508 pixels
Height : 4 960 pixels
Color space : Y
Bit depth : 1 bit
Compression mode : Lossless
General
Complete name : ./SavedByGwenview.tif
Format : TIFF
File size : 2.08 MiB
Image
Format : Raw
Width : 3 508 pixels
Height : 4 960 pixels
Color space : Y
Bit depth : 1 bit
Compression mode : Lossless
Reproducible: Always
Steps to Reproduce:
1. Open a TIFF-file.
2. Save this file as TIFF-image with alternative name (or change something
(e.g. rotation) and save the changes).
Actual Results:
Check the size of new image -- it's huge!!!
Expected Results:
Ideally files that are being edited should be saved with preserved compression
type (and even compression ratio (e.g. for JPEG format)).
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