Print Page - Getting min and max temperature of a thermal image

Title: Getting min and max temperature of a thermal image
Post by: Olex11 on March 19, 2018, 10:37:12 AM

Hi,

I have some thermal images in JPEG and I would like to find the minimal and the maximal values of temperature in the image.

Do you know if I can find these information in the metadata of the JPEG file ? If yes, how can I read them ?

Thanks in advance,

Alex

Title: Re: Getting min and max temperature of a thermal image
Post by: Phil Harvey on March 19, 2018, 11:01:38 AM

FLIR cameras write this information in their proprietary metadata, and this is decoded by ExifTool.

I don't know about any other thermal camera makes.

- Phil

Title: Re: Getting min and max temperature of a thermal image
Post by: Olex11 on March 19, 2018, 11:21:47 AM

I use images of a Flir Camera (I join an example).

I tried different command lines with Exiftool but I didn't find these information ... I only found information about the camera range values in general but not the range values in the image.

Title: Re: Getting min and max temperature of a thermal image
Post by: Phil Harvey on March 19, 2018, 11:30:41 AM

It looks like this model doesn't write the image max/min temperatures in the metadata. It does write the temperature range though. To get the max/min temperatures you could (with a lot of work) extract and process the RawThermalImage. See this thread (https://exiftool.org/forum/index.php/topic,4898.0.html) for a lengthy discussion on this topic.

- Phil

Title: Re: Getting min and max temperature of a thermal image
Post by: Olex11 on March 19, 2018, 11:38:43 AM

Ok, thank you for your help. I'll take a look to this discussion.

ExifTool Forum

ExifTool => Newbies => Topic started by: Olex11 on March 19, 2018, 10:37:12 AM