How to emulate filters
(This is the answer to a request by Ascot and follows a discussion between mainly Springtide and myself in another thread: http://www.dynaxdigital.com/index.php/topic,4772.msg34325.html#msg34325Option I
Now let's assume for one moment you did download the Lee filter swatches from somewhere- one of the easiest ways to emulate a particular Lee filter (if not completely correct nevertheless close!) is to do the following:
You can just open you image than open your Lee filter (the one you have hopefully saved somewhere on your harddrive ) and do the following:
1. click on you lee filter -> ctrl +c (=copy)
2. click on your image -> ctrl + V (=paste)
3. edit -> transform ->scale -> drage the handles until the lee filter is covering your whole image
4. set the layer blending mode from normal to colour and reduce the opacity to around 25%Please keep in mind though- real Lee filters are obviously different than colour swatches as they are made of glass and usually in front of your camera Option II
This is if you don't have the swatches:
1. open you image in PS
2. layer > new adjustment layer > photo filter > click O.K. => a new dialogue window will open
3. Now you have two alternatives: (a) you try one of the presets:
the easiest is to highlight the top one and then just scroll down by using the arrow keys on your keyboard paying attention on the effect that particular filter gives you with your image. Do not forget to play around with the density slider as well
- to get a more subtle effect!!
(b) Here it gets interesting and the Lee filters come into play: In the dialogue box instead of choosing the presets > tick "colour" => your cursor becomes a colour picker (!) > double click in the little colour window > now you can choose any colour BUT the cool thing is: you don't need to choose a colour from the dialogue window that opens but you can choose ANY colour- also one from a colour swatch that you have downloaded from the Lee website or even another photograph!!! (Just see how the colour in the little window changes accordingly to where you used your colour picker!)
Don't forget again to play around with the density slider.
Voila you should be done!For Advanced Users:
The above CAN get more complicated if you want to have 100%
the real Lee filter effect: what you would have to do is take two images of the same
object in the same light
conditions- one with the Lee filter on the other without. Now you open both up in PS next to each other. Click F8 or Window > Info > at the same spot in both of the images and measure the values for RGB in the info palette. Now you will know how much warmer/ cooler/ redder/ greener...the one with the Lee filter is compared to the one without. Now it gets tricky: once you know these exact values you have two options...(actually many many more as usual... but let's keep it simple
(a) you can make a colour balance adjustment layer and play around with the sliders until you get exactly the same values as in the image with the Lee filter and save this setting for later use in form of an action. (You could also take curves/ levels or pretty much any other adjustment layer - they are more or less all able to do that)
(b) you could follow step one from above and at first take a photofilter preset that comes close to the desired effect and play around with the density until you get the desired values- don't forget you can stack the photofilters as well
(!) (In other words you can use more than one photofilter adjustment layer)
(c) and just for the fun of it- I just throw in another option: you can use the match colour command under image > adjustments > match colour and save the statistics of the Lee filter image for future use to match with all your images... guess this leads a bit far...
I don't want to go one here (which we easily could
) just in case I scare people away- keep in mind this was a request (!). If you really need/ want to know more or something is not clear- just put it under the request section and I promise you we go a level (or two or three...
Hope this helps?