INDI Library v1.8.5 Released (19 Apr 2020)

April 2020 release of INDI Library v1.8.5 introduces new drivers while providing fixes and improvements to existing devices and core framework.

Writing dslr temperature

6 months 3 weeks ago

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Paul K

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Writing dslr temperature #48079

Hello, I would like to know if it is possible to add a function to write the temperature from the dslr sensor of the camera to the name of the fit file? How for example is this done in APT on Windows?

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6 months 3 weeks ago 6 months 3 weeks ago by Ihoujin.

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Ihoujin

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Writing dslr temperature #48086

The temperature is logged in the EXIF metadata, but is generally not shown by photo editing software. It would have to be read and added to the file name.
Currently I know of only a couple tools to access that information: ExifTool by Phil Harvey, a command line application for Windows, with a GUI made separately for it. And, EXIFlog which I have not used yet, but is evidently based on ExifTool.

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6 months 3 weeks ago

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knro

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Writing dslr temperature #48098

It's already implemented in the INDI driver. Maybe it only works for some cameras?

Jasem Mutlaq
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6 months 3 weeks ago

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Paul K

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Writing dslr temperature #48101

Hello! I did not notice such an opportunity. I have a Canon 1100d.

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6 months 3 weeks ago

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Copello

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Writing dslr temperature #48107

Hi there,

as Jasem said, it is already implemented in gphoto2 driver.
During build process it is checked whether the used libraw library supports the functionality

CHECK_STRUCT_HAS_MEMBER("libraw_imgother_t" CameraTemperature "libraw/libraw_types.h" HAVE_LIBRAW_CAMERA_TEMPERATURE LANGUAGE C)
if (HAVE_LIBRAW_CAMERA_TEMPERATURE)
  set(LIBRAW_CAMERA_TEMPERATURE 1)
  message(STATUS "Found CameraTemperature in 'libraw/libraw_types.h'")
endif ()

CHECK_STRUCT_HAS_MEMBER("libraw_imgother_t" SensorTemperature "libraw/libraw_types.h" HAVE_LIBRAW_SENSOR_TEMPERATURE LANGUAGE C)
if (HAVE_LIBRAW_SENSOR_TEMPERATURE)
  set(LIBRAW_SENSOR_TEMPERATURE 1)
  message(STATUS "Found SensorTemperature in 'libraw/libraw_types.h'")
endif ()

If libraw supports this functionality and the temperature information is also available and embedded in the DSLR RAW file, then it is read out

if (lib_raw.imgdata.other.SensorTemperature > -273.15f)
        gphoto->last_sensor_temp = lib_raw.imgdata.other.SensorTemperature;
else if (lib_raw.imgdata.other.CameraTemperature > -273.15f)
        gphoto->last_sensor_temp = lib_raw.imgdata.other.CameraTemperature;

and provided in the INDI framework, for e.g. save it as a FIT keyword.

if (isTemperatureSupported)
                {
                    double cameraTemperature = static_cast<double>(gphoto_get_last_sensor_temperature(gphotodrv));
                    if (fabs(cameraTemperature - TemperatureN[0].value) > 0.01)
                    {
                        // Check if we are getting bogus temperature values and set property to alert
                        // unless it is already set
                        if (cameraTemperature < MINUMUM_CAMERA_TEMPERATURE)
                        {
                            if (TemperatureNP.s != IPS_ALERT)
                            {
                                TemperatureNP.s = IPS_ALERT;
                                IDSetNumber(&TemperatureNP, nullptr);
                            }
                        }
                        else
                        {
                            TemperatureNP.s = IPS_OK;
                            TemperatureN[0].value = cameraTemperature;
                            IDSetNumber(&TemperatureNP, nullptr);
                        }
                    }
                }

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6 months 3 weeks ago

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Vox45

Expert Boarder

Posts: 96

Writing dslr temperature #48119

I come from Backyard OES where I found that feature really useful. I could not find this feature in Ekos and thought that was because I was saving as FIT files and not using the native RAW format of my Canon 1000D (CR2 files)

In BYOE I got files named like this : Light_0012_ISO800_300s__18C_M57.CR2 where "18C" is the temperature in Celsius.

I would love to see this implemented in Ekos

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