General > General Technical Chat

Am colour blind, need help identifying bands

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JohanH:
I've been curious about those "color blind" correction glasses that are touted online, but I haven't bothered when they are all made with tinted lenses (and I would like to use them inside). They supposedly improve color contrast and I'm sure that in theory that could work, unless you have a total lack of color perception. With good lighting I anyway see the difference, so for me they wouldn't be a big benefit anyway.

pcprogrammer:
In the second picture you can see that the colors are bleeding in the edges and changing color. At least I can on my system.

The red in the second picture to me is indeed red, but near the edges it is brown due to the bleeding.

The black ring seems to show some brown in the middle and bleeding to black in the edges so the value might well be 220uH.

De-soldering and measuring seems the best option to get to the truth.

Ed.Kloonk:
I wonder if some color filters used in image manipulation software could reveal the markings.

Do the resistor codes have any sort of standard color palate spec like international flags do?

If you present the inductor or resistor in front of a known color temp light source, the code colors should fall between certain ranges, shouldn't they?

What about color-blind apps for the phone. Do any of them help?

Kleinstein:
For good color recognition it helps if there is also quite some white the picture - cameras may adjust the white balance and this can cause additional difficulties / skews for the whole picture.

In the 2nd picture, at the lower edge there seem to be some brown/red capacitors, like the red Wima ones. This may indicate a poor white balance (or tinted light) in the picture.
The 2nd picture with daylight still is preferrable over indoor LED of CFL light that can also cause errors in the color perception. It likely does not apply here, but the purple / deep blue part can be a problem for electronic sensors / cameras.

It is hard to tell, but given that 11 µH would be an odd value I would guess more like 22 µH.

The part below looks more like a 68 Ohms resistor and not an inductor.

The color look boarderline, more brown than red. So a color regocnition app on a phone would not really help.
I don't hink there are strict standards on the colors, more like ROHS limitations that prevent some pigments (e.g. Hg containing red). red paint is often relatively transparent, so that the green background could effect the color.

magic:
Yes, it's hopeless.

Look at the second picture and the third band of L2 appears brown when compared to the black on the resistor below.
Look at the first picture and they are more similar.

So which picture is true?

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