Backyard Aquaponics
A place to discuss aquaponics

I have now added the ability to calibrate the colours that you compare against, so that you can adjust them to suit your camera, conditions etc. You can also use this to set up for the sera test kit or other test kits.

If you want to calibrate, for example, the pH test, the moment you add your calibration value, it will ignore all the default values for the pH test, so you will need to add the colours for all the values of that test.

Your calibration will be stored for your future use, so you need to join in order for these to be saved. You can change or delete any of the values you added at any time. If you delete them all for a test, it will revert to the defaults.

Let me know if you have any issues with this, and whether you find this useful.


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This is pretty sweet! Nice work.

However, this might all be averted if API sold the Color Chart by itself!

Just an idea...

What if you took a photo of the test solution and the colour strip at the same time?
Then the peculiarities of that camera and lighting arrangement would be the same for both samples.
This would minimise the chance of the numbers being different, you can use the colour picker to compare colour values in the one image.

Old thread, but this is a common photographer's problem.
Ever wondered why most professional camera bags are the same shade of grey?
It's 18% grey. It's a photographic approximation of average caucasian skin tone which is what your camera is designed to make look "right" under different light. If Aunt Betty looks slightly purple you notice it more than the shade of her dress being a bit off.
This is a bigger problem than most people realise, our eyes compensate for a LOT. Someone standing in the shade of a dense tree is blue because they are lit by the diffuse blue sky. stand under a beige patio with paving around it you look completely different again.


Use auto white balance, photograph the tube on a strip of white card against the 18% grey under diffuse even light. You need most of the photo to be of the grey.
This method will get fairly close with basic materials. It might be close enough to be useful but no guarantees.
I definitely wouldnt use it for any science, but it's better than nothing for someone with atypical colour vision.

I have a lightbox I made using a flatbed scanner light source which I use to use for my film photogtaphy to look at slides, a consistent light source like that would be even better. With the curtains drawn.