haasje dutchairbrush
Air-Valve Autobot!
I got asked this question by mail and as I had to wite it down anyway I thought it might be a good idea to post it here also as it does seem to be a reoccuring question
Why does my white turn blue when airbrushed on another color?
First off, the technical explenation: http://www.ing.unibs.it/~zkovacs/color/TiO2_E.htm
The above link is the scientific explenation for those who find it interesting (I don't think I got half off it ) what follows is the short "for dumies " version in regard to airbrushing
When using white on any other color, but most noticably on black one will see that the white gets a blue hue, this is known as "blue shift". Most people starting out with airbrushing and without a background in art will be surprised by this and wonder what they are doing wrong.
Nothing is going wrong here, this is just how it works (see the lengthy technical explenation) and it's something an airbrusher has to learn to live with/work with. The blue shift is often seen as something anoying but once one accepts it as just a fact it can also be used to ones advantage.
How to prevent/work around blue shift
-The easiest method is just not to use white. This is one of the reasons we see so much erasing and scratching going on in airbrushing. To avoid blue shift the white of the paper is used.
-Work from light to dark. The problem here will be that mistakes will be tough to correct (especialy when working transparant)
-Orange being the opposite color of blue can negate the color blue. Adding a minute amount of orange to white can thus neutralise the blue shift (this sounds easy but it takes some practice as too much orange and your white is no longer white and not enough and you'll still have a blue shift)
-A "dirty trick" when using whites in parts and thus getting a blue shift is to fog over the entire piece with a very reduced white. This will cause a blue shift on the entire picture making it not stand out anymore. If using this trick (I use it only when doing rush jobs) it's advisable to do it before going in with the real darks (shadows)
Using blue shift to ones advantage
As said one won't get around blue shift, it's here to stay . Knowing this it can also be used to ones advantage though.
When used propperly blue shift can create the illusion of wetness or translucency.
-It can be used as a "white wash" where an area is fogged in with a reduced white. This will merge/blend the colors beneath it. This is a good effect to use on skintone or eyes as it will give it a translucent effect.
-When doing a "wet" texture (reptile skin for instance) using white to do highlights will have the blue shift create the illusion of it being wet.
As said above this is the short "for dummies" version there is probably a lot more to say about it but I think this covers the most important stuff in regards to airbrushing and blue shift
Why does my white turn blue when airbrushed on another color?
First off, the technical explenation: http://www.ing.unibs.it/~zkovacs/color/TiO2_E.htm
The above link is the scientific explenation for those who find it interesting (I don't think I got half off it ) what follows is the short "for dumies " version in regard to airbrushing
When using white on any other color, but most noticably on black one will see that the white gets a blue hue, this is known as "blue shift". Most people starting out with airbrushing and without a background in art will be surprised by this and wonder what they are doing wrong.
Nothing is going wrong here, this is just how it works (see the lengthy technical explenation) and it's something an airbrusher has to learn to live with/work with. The blue shift is often seen as something anoying but once one accepts it as just a fact it can also be used to ones advantage.
How to prevent/work around blue shift
-The easiest method is just not to use white. This is one of the reasons we see so much erasing and scratching going on in airbrushing. To avoid blue shift the white of the paper is used.
-Work from light to dark. The problem here will be that mistakes will be tough to correct (especialy when working transparant)
-Orange being the opposite color of blue can negate the color blue. Adding a minute amount of orange to white can thus neutralise the blue shift (this sounds easy but it takes some practice as too much orange and your white is no longer white and not enough and you'll still have a blue shift)
-A "dirty trick" when using whites in parts and thus getting a blue shift is to fog over the entire piece with a very reduced white. This will cause a blue shift on the entire picture making it not stand out anymore. If using this trick (I use it only when doing rush jobs) it's advisable to do it before going in with the real darks (shadows)
Using blue shift to ones advantage
As said one won't get around blue shift, it's here to stay . Knowing this it can also be used to ones advantage though.
When used propperly blue shift can create the illusion of wetness or translucency.
-It can be used as a "white wash" where an area is fogged in with a reduced white. This will merge/blend the colors beneath it. This is a good effect to use on skintone or eyes as it will give it a translucent effect.
-When doing a "wet" texture (reptile skin for instance) using white to do highlights will have the blue shift create the illusion of it being wet.
As said above this is the short "for dummies" version there is probably a lot more to say about it but I think this covers the most important stuff in regards to airbrushing and blue shift