[QGIS-Developer] simple raster not showing on qgis

[Tim Sutton]

Hi

Confirmed here:

gdal_translate test_gdal_calc_py_9_1.tif -colorinterp red -of PNG test.png
- shows in QGIS
gdal_translate test_gdal_calc_py_9_1.tif -colorinterp red -of GTIFF
test.tif - doesn't show in QGIS

Probably best to open a ticket.

Regards

Tim

On Mon, Oct 19, 2020 at 8:25 AM Idan Miara <idan at miara.com> wrote:

> Hi,
>
> I'm trying to load in QGIS the attached 24KB simple single byte raster
> (for debugging gdal_calc.py)
> It seems that it is valid, it has a non trivial histogram and it loads
> fine in some picture viewers that I've tried, ms-paint, for instance.
> But when I try to load it in QGIS (3.14 or 2.18) it seems as if the extent
> is empty.
> I zoom to extent and I see nothing, when I try to click on it with the
> "Identify features" tool it shows nothing.
> The histogram computed in QGIS also looks fine.
>
>
> https://drive.google.com/file/d/1LKcQTsnqfW4Ouiqnd3WpOBtw5EeoIRUl/view?usp=sharing
>
> Please advise,
> Idan
>
> gdalinfo -hist test_gdal_calc_py_9_1.tif
>
> Driver: GTiff/GeoTIFF
> Files: d:\dev\gis\gdal1\autotest\pyscripts\tmp\test_gdal_calc_py_9_1.tif
> Size is 162, 150
> Origin = (0.000000000000000,0.000000000000000)
> Pixel Size = (1.000000000000000,1.000000000000000)
> Image Structure Metadata:
>   INTERLEAVE=BAND
> Corner Coordinates:
> Upper Left  (   0.0000000,   0.0000000)
> Lower Left  (       0.000,     150.000)
> Upper Right ( 162.0000000,   0.0000000)
> Lower Right (     162.000,     150.000)
> Center      (  81.0000000,  75.0000000)
> Band 1 Block=162x50 Type=Byte, ColorInterp=Gray
> 0...10...20...30...40...50...60...70...80...90...100 - done.
>   256 buckets from -0.5 to 255.5:
>   16777 819 118 48 4 7 12 76 159 156 120 122 140 111 104 95 88 91 95 81 68
> 93 66 66 81 57 72 61 70 69 68 59 69 88 60 56 38 69 58 56 55 54 52 62 61 51
> 51 36 46 43 42 47 52 48 32 50 42 32 44 33 34 39 29 36 20 24 26 26 24 18 35
> 24 32 34 35 39 44 28 28 29 31 34 30 22 30 18 18 28 28 20 21 19 21 31 17 27
> 17 19 25 22 19 17 17 11 13 18 16 16 15 17 21 12 7 19 12 17 12 15 21 13 13
> 17 11 11 13 13 13 15 10 15 15 17 8 11 7 7 9 11 10 8 10 12 11 8 7 5 10 5 5 6
> 5 9 12 3 6 9 6 8 7 7 11 6 8 9 7 10 1 4 6 6 7 7 4 6 5 6 3 12 6 3 3 6 9 6 3 5
> 7 8 1 2 2 2 3 4 4 5 3 4 3 2 3 2 3 1 5 5 2 3 3 5 3 4 2 2 2 5 3 5 2 3 4 2 8 5
> 5 10 3 3 4 3 4 7 2 7 4 9 9 16 18 13 13 7 23 17 20 22 51 77 51 45 37 45 40
> 56 68 0
>   NoData Value=255
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Tim Sutton
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