When is the power consumption very high? When the camera is active or in other situations?

I assume by "auto" function you mean the automatic selection of the scan-area? You're right, the current code only a very quick hack and needs to be improved.

Thanks for the hint. That was indeed a bug. Should be fixed in v0.2.1

Hm, I cannot reproduce that, it works on my phone pretty well. The dependencies of the rpm-files (as shown by "rpm -qpR *.rpm") have been changed as in the following diff:

% diff -u0 ../release/RPMS/dep-0.{1,2}
--- ../release/RPMS/dep-0.1     2019-05-27 21:54:20.135478271 +0200
+++ ../release/RPMS/dep-0.2     2019-05-27 21:54:27.600231369 +0200
@@ -6,0 +7,2 @@
+libQt5Multimedia.so.5
+libQt5Multimedia.so.5(Qt_5)
@@ -38,0 +41 @@
+libstdc++.so.6(GLIBCXX_3.4.20)
@@ -45 +47,0 @@
-rtld(GNU_HASH)

There are three changes:

1. A new dependency on Qt5Multimedia -- I had to add this because I needed some function. But this should be part of your Qt5 installation (it's one of the allowed standard libraries on Sailfish)
2. A dependency on a newer version of libstdc++ ... I do not know where this comes from, maybe the SDK version (for Sailfish 3.0.3.9)?
3. The dependency on "rtld" has been removed.

Does one of these changes explain your problem? Is there an error message? Can you install the package from the command line?

Thanks. I found my old Jolla 1 and could reproduce the problem. It should be solved in the next version, which will be released in a few days.

Yes, the color mode has been missing for some reason (it is now integrated in trunk). Regarding the "magic" mode ... it is supposed to reduce the number of colors, in particular to get nice pictures with white background and powerful colors from a whiteboard painting (which is a common use case for me) ... but as I said, the current implementation is merely a quick hack and needs some improvement.

Yes, I remembered that app. Maybe it had been better to pick up its development but I had feeling I would have end up rewriting everything ...