iMonAd turns your iPhone into a inexpensive RGB analyzer.
In the following explanations not all possibilities are given, there are more
combinations of settings possible.
This manual is valid for V1.20
Run in normal screen
The upper dark gray window contains the exposure value and
average gray on the entire camera image.
The second window, showing RGB, shows the three separate
color channels (red, green, blue) as figures.
The third window shows the selected WP threshold. This is
the minimum level a pixel (all three color channels combined) must have to be
The next and largest window needs some more explanation.
The second row is like the RGB separation in the second
window, except for the selection of the pixels.
The next row shows the relative gain. The highest channel is
referenced as 1.0000 and the others must be multiplied by the displayed figure
to get the same RGB level.
The last row shows the point in the histogram where the integral area is 50% of the total area.
The big figure under "RGB neutral offset" shows the average
(square root from the sum of all three channels powered to two) of the three
The last big number is the estimated white balance color
temperature. You can check e.g. your monitor settings from a white window,
normally your monitor should be something around 6500K
The small black square with the colored bars shows the values of the three color channels from 0-255 and the gray bar bar runs from 0 to 16 EV for the image.
When you tap on the small camera view the current values for "RGB neutral offset" and "color temperature" are saved. From now on these values are subtracted from the live values. In front of the displayed label "rel" is shown and the values show the difference. The live values can be restored by tapping the view again.
Run in histogram screen
Some of the following pictures are taken with iZoner, these show the same graph part.
This view is the most difficult to explain, but contains for the eager
photographer lots of information.
In the upper left corner the live view of the camera is visible.
When you use a single source light the reflected light on a gray card should
show three different channels close to each other. When you turn on other
sources with different physics (LED and a normal lamp), you will see that the
color channels are drifting apart. When you take a picture with your camera, using this light setup, there will
be a color cast in your photo.
To do this test, even a white piece of paper will work (as long as there is no color in it), but the best is a standard gray card.
If you think the image is constantly changing in brightness, you can freeze it by tapping on the picture. Tapping again starts the live view.
What do we see here?
Just one more last example.
To get more feeling with this view and learn to see colors/tones, you can try lots of different scenes while waiting at the doctors or dentists.
On this view there are some figures to help you.
Peak: highest value for a color channel
iMonAd doesn't require lots of settings, most of the time you will not touch it
The white threshold level sets the gray level (a combination of RGB) a pixel must have at least to be used for the calculations in the lower part of the run screen.
On the run screen you find an EV level. With this figure you can find in tables the exposure time/aperture combination at 100ISO. When you compare this to your camera there might be a difference. If you want to, you can adjust is to get the same figures. This is not necessary for the color analysis.
Tapping on this screen will bring you to other worlds.
Globe : to this help page.
If you enable "show hints", tapping on the run screen will show a short information on certain parts.
Be aware that for the other worlds, an internet connection is used and can be charged by your provider.
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