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- Apr 7, 2020
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Calcium
For the first Red Sea Pro Calcium post I used a ~6 inch distance from the phone to the vial and used the Red from the RGB as the indicator for test completion.
Here I have a back to back comparison with the vial at a distance (~6 inches away) and with the vial against the camera using the foam block.
The 6 inch distance results are compared using the RGB Red as the indicator and with the HSV Hue as a comparison. The foam block results with the vial against the camera only use the HSV Hue results.
The plot labeled "Calcium at Distance : Red" is the camera at ~6 inches using the RGB Red as the indicator. I have been using a value of Red < 50 as the test stop which would be 0.92ml. The curve passing through 50 has a slowly decreasing slope, so picking the 50 value was just a judgment call and I held it the same to be repeatable test to test.
The plot labeled "Calcium at Distance : Hue" is the camera at 6 inches using the HSV Hue as the indicator. The shape is very similar to the Red curve discussed above, and the slope at 0.92 ml is also a slow transition.
The color vial screen grabs are included. These have the vial visible in the picture. The HSV and RGV value are included in the top left and top right of the screen grabs and the tests are labeled with the amount of titrant added.
The plot labeled "Calcium in Foam Block:Hue" has the vial up against the camera in the foam block with the camera flashlight on and uses the HSV Hue as the indicator. Here the Hue curve makes a clear shift at 0.92ml which is a much clearer indicator that the previous plots. The 0.92ml give a Calcium value of 460.
The color screen grabs for the calcium show a very uniform color. The calcium test is very opaque which distributes the light uniformly with no glare spots or reflections and very little color variation. The RGB Red indicator in these plots also does a very clear transition dropping from 224 at 0.90ml to 5 at 0.92ml.
For future tests I will proceed with the foam block and HSV Hue as the indicator. I will use 240 as the Hue indicator with the test complete at the point where the Hue is less than 240. With the high slope this becomes a much more repeatable test with a very clear indicator. Switching to the foam block and using HUE made this test much easier to indicate the color change compared to what I was doing before. The uniform colors up close also make the test more repeatable.
For the first Red Sea Pro Calcium post I used a ~6 inch distance from the phone to the vial and used the Red from the RGB as the indicator for test completion.
Here I have a back to back comparison with the vial at a distance (~6 inches away) and with the vial against the camera using the foam block.
The 6 inch distance results are compared using the RGB Red as the indicator and with the HSV Hue as a comparison. The foam block results with the vial against the camera only use the HSV Hue results.
The plot labeled "Calcium at Distance : Red" is the camera at ~6 inches using the RGB Red as the indicator. I have been using a value of Red < 50 as the test stop which would be 0.92ml. The curve passing through 50 has a slowly decreasing slope, so picking the 50 value was just a judgment call and I held it the same to be repeatable test to test.
The plot labeled "Calcium at Distance : Hue" is the camera at 6 inches using the HSV Hue as the indicator. The shape is very similar to the Red curve discussed above, and the slope at 0.92 ml is also a slow transition.
The color vial screen grabs are included. These have the vial visible in the picture. The HSV and RGV value are included in the top left and top right of the screen grabs and the tests are labeled with the amount of titrant added.
The plot labeled "Calcium in Foam Block:Hue" has the vial up against the camera in the foam block with the camera flashlight on and uses the HSV Hue as the indicator. Here the Hue curve makes a clear shift at 0.92ml which is a much clearer indicator that the previous plots. The 0.92ml give a Calcium value of 460.
The color screen grabs for the calcium show a very uniform color. The calcium test is very opaque which distributes the light uniformly with no glare spots or reflections and very little color variation. The RGB Red indicator in these plots also does a very clear transition dropping from 224 at 0.90ml to 5 at 0.92ml.
For future tests I will proceed with the foam block and HSV Hue as the indicator. I will use 240 as the Hue indicator with the test complete at the point where the Hue is less than 240. With the high slope this becomes a much more repeatable test with a very clear indicator. Switching to the foam block and using HUE made this test much easier to indicate the color change compared to what I was doing before. The uniform colors up close also make the test more repeatable.