Old style colouring of engineering drawings.

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Old style colouring of engineering drawings.

This topic has 14 replies, 8 voices, and was last updated 28 October 2011 at 09:45 by Gordon W.

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25 October 2011 at 19:49 #76858
Maurice Cox 1
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@mauricecox1
I have a couple of books with examples of old drawings that have been colour washed, acording to the material used, and whether or not it is in section. They are works of art. I would like to reproduce something of the sort using CAD. I have Henry Adams’ Engineering Handbook, which lists the colours. My question is, does anyone know the RGB equivalent of “Payne’s grey, dark” or “Prusian blue, very pale” and so on. I can get a sort of value for some by scanning the drawings I have, but I’m not sure how well the colours have been printed, and the samples I have only use about four of the colours. A colour chart would be ideal, but I am not too hopeful of one existing. Can anyone help me please?
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25 October 2011 at 19:49 #21129
Maurice Cox 1
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@mauricecox1
25 October 2011 at 20:25 #76860
David Littlewood
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@davidlittlewood51847
Payne’s grey is a dark grey-blue colour, and prussian blue is a very dark blue with a slight tint towards green (as opposed to ultramarine, a very pure blue). The pigment in prussian blue is, IIRC, ferrous hexacyanoferrate (II). If you go into an artists’ materials shop you should be able to find both colours available there in oils, watercolours and acrylics, and it might be worth your while buying a small tube of each in watercolour or acrylic to make yourself a demo card. If the worst comes to the worst you could even give your drawings a wash of real colour!

David
25 October 2011 at 20:30 #76861
JasonB
Moderator
@jasonb
Any good art shop should have charts of their “artists watercolours” , not the printed ones but actual hand tinted colour charts though they may not let them be taken out of the shop. The Artists colours use pure pigments although now some are synthetic due to health issues or scarcity of the pigment.

Failing that have a look at either Daler Rowney’s or Winsor & Newton’s sites and get the colours from there.

You should also take into account that the lighter shades are obtained by using a more dilute mix and allowing the white of the paper to show through so both those colours can actually be quite dark or almost a translucent wash.

J

Edited By JasonB on 25/10/2011 20:31:33
25 October 2011 at 21:28 #76870
Sub Mandrel
Participant
@submandrel
Hooray for such things.

I for one think it’s a shame that now computers give us the capability of easily and consistently using colours and textures, maodern drawings look blander than ever.

I’m drawing up my little deisel shunter project, and I’m using lots of colour for my own benefit – but I’d never dare submit a coloured drawing to ME*!

Neil

*As against a 3D model, which it does seem conventional to colour.
25 October 2011 at 21:35 #76872
Ed Duffner
Participant
@edduffner79357
Hi Maurice,

Here are a couple of links to an art website that give you the colours including RGB, CMYK, Web and other values underneath.

http://www.art-paints.com/Paints/Acrylic/Fundamentals/Prussian-Blue/Prussian-Blue.html

http://www.art-paints.com/Paints/Acrylic/Cryla-Daler/Paynes-Grey/Paynes-Grey.html

Regards,
Ed.
25 October 2011 at 22:36 #76874
David Littlewood
Participant
@davidlittlewood51847
Neither of those colour squares look close to the tubes of paint I have here – at least on my monitor (which, to be fair, has not been colour calibrated). The prussian blue lacks the slight turquoise tint I would expect to see, and the payne’s grey does not have the slight blue tint.

David
26 October 2011 at 07:32 #76886
JasonB
Moderator
@jasonb
Forget those acrylics, the colours are way off as David says.

The drawings would have been watercolour washed so look at the artists water colours as I suggested. The screen colours are still likely to be off but its worth seing what teh RGB figures come out like.

Prussian

Paynes grey

And this is the W&N chat, again screen colours will only be approx
26 October 2011 at 09:53 #76894
Gordon W
Participant
@gordonw
Very interesting. I have actually coloured drawings, in the dim past, tho’ usually for architects drawings. As I recall just used a pan of water colours ( the solid cakes) and washed it on .Modern acrylics look nothing like them, nor do printer inks, tho’ the colour might be true.
26 October 2011 at 12:26 #76902
David Littlewood
Participant
@davidlittlewood51847
Jason,

Both those scans are very much closer to the paints I have, and to my memory of other sources. Well done, saved me the trouble of painting a patch and scanning it.

IIRC, weak washes of payne’s grey show up the blue tint even more noticeably. Used to use it in the dim and distant past for painting faded blue uniforms.

David
26 October 2011 at 16:30 #76912
JasonB
Moderator
@jasonb
Yes they are not bad but best to have a look at the hand tinted colour charts if possible. I know they can be bought but are not cheap. I used to work in an art shop and we always kept them behind the counter.

I did do a bit of colour rendering when at college but that was architectural like Gordon. The only painting I do now is with Artists oils and not on canvas but do paint uniforms like these
27 October 2011 at 20:31 #76962
Maurice Cox 1
Participant
@mauricecox1
Thanks for all the feedback and links. I will try the local art shops for colour charts. When it come to the actual colouring of the drawing, I will probably save it as a jpeg, file, then open and colour it using Photoshop. This will enable me to get much more subtle colour washes than the blunt colour fill of Turbocad. Thanks again.
27 October 2011 at 21:28 #76964
Steve Garnett
Participant
@stevegarnett62550
Posted by Maurice on 25/10/2011 19:49:23:

I would like to reproduce something of the sort using CAD. I have Henry Adams’ Engineering Handbook, which lists the colours. My question is, does anyone know the RGB equivalent of “Payne’s grey, dark” or “Prusian blue, very pale” and so on. I can get a sort of value for some by scanning the drawings I have, but I’m not sure how well the colours have been printed, and the samples I have only use about four of the colours. A colour chart would be ideal, but I am not too hopeful of one existing. Can anyone help me please?

A quick search reveals the following:

Payne’s Grey – RGB values, etc.

Prussian Blue – RGB values, etc.

Obviously how well these will reproduce depends entirely on what you reproduce them on. I would have thought that a printer that can be calibrated to do a good job with photographs should be able to manage this okay.
28 October 2011 at 08:04 #76973
John McNamara
Participant
@johnmcnamara74883
Hi Steve

Handy site for RGB values

Book marked and thank you

Cheers

John
28 October 2011 at 09:45 #76979
Gordon W
Participant
@gordonw
Why not print out the drawing, on decent paper, then colour using water paint and brush ?
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