Wrong histogram plot if raster data type is byte

[andremano]

What is the bug or the crash?

If a raster is of type byte, the histogram plot appears to be incorrect. Below the histogram calculated over a byte data type (incorrect):

If we export the raster into float32 then we get the correct histogram:

Steps to reproduce the issue

Use this dataset an calculate histogram over band 4 (example depicted above) over the tm24aug99_sub raster (byte) and comparre it with histogram obrained from tm24aug99_REFORGED (float32).

Versions

QGIS version
3.16.11-Hannover
QGIS code revision
26cc1c7
Compiled against Qt
5.15.2
Running against Qt
5.15.2
Compiled against GDAL/OGR
3.3.1
Running against GDAL/OGR
3.3.1
Compiled against GEOS
3.9.1-CAPI-1.14.2
Running against GEOS
3.9.1-CAPI-1.14.2
Compiled against SQLite
3.35.2
Running against SQLite
3.35.2
PostgreSQL Client Version
13.0
SpatiaLite Version
5.0.1
QWT Version
6.1.3
QScintilla2 Version
2.11.5
Compiled against PROJ
8.1.1
Running against PROJ
Rel. 8.1.1, September 1st, 2021
OS Version
Windows 10 Version 2009
Active python plugins
csv_tools;
pg_raster_import;
quick_map_services;
db_manager;
MetaSearch;
processing

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

In QGIS 3.10 this did not occur. Issue occurs since 3.16.1 and continues into 3.16.11.

[gioman]

@andremano duplicate of #44927 ?

[elpaso]

I have the feeling that this was fixed in master, can you please check?

[andremano]

@andremano duplicate of #44927 ?

It appears so.

[andremano]

I have the feeling that this was fixed in master, can you please check?

sure

[andremano]

I have the feeling that this was fixed in master, can you please check?

Issue remains. See below the test environment:

QGIS version 3.21.0-Master
QGIS code revision de53894

[gioman]

Issue remains. See below the test environment:

QGIS version 3.21.0-Master QGIS code revision de53894

@andremano please also leave this comment in the other ticket.

[andremano]

just re-opening this issue - i accidentely closed it

[gioman]

@andremano if is duplicate of the other ticket this must be closed.