Quoted from Crash:
From the looks of that photo the filter you include seems to do a great job at blurring the RGB LEDs together to a single color dot. Any comparison photos with and without the filter?
That effect is actually a visual effect that the phone camera produces when taking the image. The LEDs on these screens look very bright, and that saturates the objective of the automatic cameras, which affects the autofocus, hence the dots are blurred, appearing a uniform color. If instead of using the camera of my cell phone, I use my Nikon camera with manual adjustment of the aperture and the exposure time, the look will be different.
Some time ago I posted a comparative image here, but it was 192x64 and 128x32, and also in different ambient light conditions.
Shortly I will receive amber filters, which I have orders, and also a new type of gray filter. Then I will do a test and take pictures, of a screen, with and without a filter, in the same conditions of ambient light, so that the difference between mounting and not the filter is appreciated. In any case, the contrast of the image improves a lot with the filter and the LEDs turned off are practically hidden, the filter is highly recommended to obtain the best image quality.
I have another filter, to blur and mix the 3 colors of each LED, but it needs an additional mask, which is quite complicated to do. I have not found that type of filter that mixes and blends the colors to get an ideal color.
I always suggest the Amber filter in all my DMDMK66 sales, and most users buy it. It is a major improvement, in the quality of the image, and the additional cost is very small. It may be that the filter also produces a positive effect by mixing the colors of each point, but it is something that I have not checked, making comparisons.