Shooting with filters?? Advice for a newbie.

markjwyatt · Oct 15, 2018

markjwyatt said:
Thanks! Picked up an English version (mein Deutsch ist nicht gut genug fur die Deuthscher buch) for $3 + $3.99 shipping on Amazon. Filter Practice, Hans Clauss, Heinz Meusel

Finally got a copy after a couple of failures. My copy is missing the color plate on the inside rear of the book showing the color version of the "color star" used throughout to show effect of filtration. If anyone has the book and could upload a color image of this color star, it would be appreciated. This is a nice introductory book.

AgX · Oct 16, 2018

You practically are missing nothing, though the schematic is nicely designed.
It seems unique as under "colour wheel" Google could not show me a similar one.

But at least in the 3rd german edition it no longer was included.

It is a circle, filled with three stripes, half-diameter wide, going through center, rotated by 45° to each other,
The stripes are coloured cyan, magenta, yellow.

The resulting fields are:
outer: 2x cyan, yellow, magenta
intermediate: 2x blue, green red
central: black

It is easily overlooked or interpreted as empty envelope, as it is glued-in face down.

Michael L. · Oct 16, 2018

Hello markjwyatt,
I enclose a flatbed scan of the colour plate attached to the inside back cover of the 1st German edition (1962) of this excellent book. The colours are a little off, as my scanner is rather old and unsophisticated, and they may be further skewed by the settings on your monitor. Still, I hope the scan will provide a useful complement to AgX's fine description (above).
In the 5th German edition (1981) the colour schematic is included in the text proper on p. 58. Perhaps that is also the case with the copy you have found?

markjwyatt · Oct 16, 2018

Michael L. said:
Hello markjwyatt,
I enclose a flatbed scan of the colour plate attached to the inside back cover of the 1st German edition (1962) of this excellent book. The colours are a little off, as my scanner is rather old and unsophisticated, and they may be further skewed by the settings on your monitor. Still, I hope the scan will provide a useful complement to AgX's fine description (above).
In the 5th German edition (1981) the colour schematic is included in the text proper on p. 58. Perhaps that is also the case with the copy you have found?

View attachment 209495

Thank you, Michael! Looks like CYM on the outer circular sections. RG(?) on the stars. Black center. The vertical star points appear to be between blue and purple. If that is what you see, then this is ready to go. If not just tell me if it is actually Blue (as would make sense, i.e., RGB). As you say between scanners and monitors (mine is not corrected), things may turn out a little different.

I have the 1969 edition (reprint of 1964 edition). I am not finding a text description of the color wheel.

AgX · Oct 16, 2018

Not quite.
It is intended to show the effect of the overlaying of three standard subtractive filters has: the forming of colours from the additve range, as well as black.

Typically this is done by letting three circular standard subtractive filters overlap. In that book three stripes of filters are used. Same effect, but a bit different graphic representation.

markjwyatt · Oct 16, 2018

AgX said:
Not quite.
It is intended to show the effect of the overlaying of three standard subtractive filters has: the forming of colours from the additve range, as well as black.

Typically this is done by letting three circular standard subtractive filters overlap. In that book three stripes of filters are used. Same effect, but a bit different graphic representation.

So do you think the vertical triangles (North and South) should be blue rather than purple? Do they look blue to you on your monitor? Mine look purple.

markjwyatt · Oct 16, 2018

AgX said:
You practically are missing nothing, though the schematic is nicely designed.
It seems unique as under "colour wheel" Google could not show me a similar one.

But at least in the 3rd german edition it no longer was included.

It is a circle, filled with three stripes, half-diameter wide, going through center, rotated by 45° to each other,
The stripes are coloured cyan, magenta, yellow.

The resulting fields are:
outer: 2x cyan, yellow, magenta
intermediate: 2x blue, green red
central: black

It is easily overlooked or interpreted as empty envelope, as it is glued-in face down.

Hi AgX- I missed this explanation for the construction of the color circle. Makes sense, thanks. I can see the stripes. So the N and S triangles should appear blue. The point is I see a more [dark] purplish color, not a pure blue, but certainly more blue than magenta. It could be my monitor, the scan, etc. I think primary blue is this. Compare it to the N-S triangles.

Based on what I am, seeing I suspect the scan may be a little magenta or red. I might try color correcting in Gimp to see if I can make it yield closer primary colors.

markjwyatt · Oct 16, 2018

View attachment 209574
How is this? Looks a bit better on my screen. Increased exposure, removed magenta and red, removed noise. Red is blotchy and looking a little yellow... Blue is on the dark side. Green a bit cyan.

AgX · Oct 17, 2018

markjwyatt said:
So do you think the vertical triangles (North and South) should be blue rather than purple? Do they look blue to you on your monitor? Mine look purple.

No the schematic is right.
True additive blue is rather a purple. One famous teacher on colour theory named it even violet-blue.

Though giving names to hues is tricky...
And in most printed schematics that blue comes over quite bad as being formed on the subtractive colours dyes, that are printed in a mixture of subtractive and additive system (not truly overlapping dots).

markjwyatt · Oct 17, 2018

AgX said:
No the schematic is right.
True additive blue is rather a purple. One famous teacher on colour theory named it even violet-blue.

Though giving names to hues is tricky...
And in most printed schematics that blue comes over quite bad as being formed on the subtractive colours dyes, that are printed in a mixture of subtractive and additive system (not truly overlapping dots).

Interesting: https://en.wikipedia.org/w/index.php?title=Shades_of_blue&action=edit&section=10

Blue (CMYK) (pigment blue)
sRGBB (r, g, b) (51, 51, 153)

Not quite as purple, but certainly a darker blue. This is a little complicated ( as color theory tends to be). I still think my correction is a bit closer (at least for the blue)...

AgX · Oct 17, 2018

Varying the brightness of a colour may came over actually changing the hue.

I learned colour theory in times before personal computers. I used special CYM/RGB W/B paints.

Shooting with filters?? Advice for a newbie.

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