Harris Shutter Effect

[stitch]

Hi everybody,

 

has anyone a recommendation on how to create an harris shutter effect in Affinity Photo?

In Adobe Photoshop is was pretty easy: Layer Style -> Advances Blending -> exclude different RGB channels.

If you exclued a channel in Affinity Photo it has not the same effect.

 

Thanks for your tips.

[Dan C]

Hi stitch,

Welcome to the forums

You can use a Channel Mixer Adjustment under Layer>New Adjustment Layer. For each layer you can set one colour to 100% (default) and set the other 2 channels to 0%.

Quick example of this:

 

[R C-R]

6 hours ago, Dan C said:

Quick example of this:

I haven't tried it, but that looks like something a set of 3 macros might simplify. Anybody want to give that a go? 

[stitch]

Hi Dan C,

many thanks for your quick answer. It's not quite what I was looking for.

I wanted to create something like that: https://www.youtube.com/watch?v=oT8ZHizaaNM

An further suggestions?

 

[firstdefence]

The problem in Affinity is it doesn't retain the shading while having the cyan, magenta and yellow channels, the shading is inverted to show highlight. I think the subject has to be right as well, I don't think dark images would work the same as a blonde, fair skinned girl on a white or transparent background.

[firstdefence]

I think I've got the effect, well how to get the channels to show as Photoshop does.

[firstdefence]

1. To get the image as above... go to the Channels Panel.
2. right-click  Background Green and select Clear
3. right-click  Background Blue and select Clear
4. right-click  Background Red and select Invert
5. Now go to Layer > Invert

You should end up with the image colouring above. Below is a very quick tutorial to show the method I worked out.

 

[stitch]

Hi firstdefence, you are great!

 

Yeah, thanks! Your explanation helped a lot! It's what I was looking for

If you then use a filter to erase white paper and reduce the opacity it's perfect!

Many thanks! :-)

[amunaptra2001]

This is just what I was looking for except one step short. Once you have the 3 images seperated and the colours masked, is there a way to merge them so that everythin that's in the same position reverts to it's original colours and anything that has changed blends into a kind of rainbow effect. For example, smoke, 3 successive images of a fire or something like that?

[kirkt]

@stitch - To create the Harris Shutter effect, you need to take three images and put the red channel from the first, the green channel from the second, and the blue channel from the third into a single document.  Objects in all of the images that are stationary with respect to the frame will appear as normal, full color; objects that move relative to the frame will create a rainbow-like offset effect.  To do this, you can import the three images onto three layers in your working document. Then you can select the red channel from the first layer, the green channel from the second layer and the blue channel from the third layer, for example, and place them into their respective channels on a new pixel layer.  This is done easily using spare channels.  Create a spare channel from the RED of the first image and rename it "RED."  Create a spare channel from the GREEN of the second image layer and rename it "GREEN" and create a spare channel from the BLUE channel of the third image layer and rename it "BLUE."  Then, make a new pixel layer and make it the active layer in the stack - let's call this layer "Harris."  Right-click on the RED spare channel and select "Load to Harris Red" - repeat for the GREEN and BLUE spare channels, selecting "Load to Harris (GREEN or BLUE).

In the attached example, I took the red channel from the first image, the green channel from the second image and the blue channel from the third image and combined them as outlined above to produce the Harris Shutter result.

Kirk

[kirkt]

You can also do this with fewer steps using the Apply Image command and Equations.  For this example, assume that you have a new document open, with the three source images layered in it.  The first layer will be the image that will give us the RED channel for the Harris composite - call this layer RED.  Same for the other two layers, call them GREEN (second layer) and BLUE (third layer).  On the top of the layer stack, create a new pixel layer called HARRIS - make sure you fill the Alpha channel (select the HARRIS layer, then in the Channels palette, right-click on HARRIS Alpha and select "Fill" to make the Alpha channel filled with white).

Now the fun begins.

1) If it is not the active layer, select the HARRIS Layer to make it active - this is going to be the layer upon which the Apply Image filter operates, so it needs to be the active layer before invoking the Apply Image command.

2) Select Filters > Apply Image...

3a) For this step, we are going to place the red channel from the RED image layer into the red channel of the HARRIS layer.  To do this, drag the RED layer from the Layers palette onto the upper area in the Apply Image dialog to make the RED layer the source for the Apply Image operation.

3b) Next, check the "Equations" box and make sure the Equation Color Space is set to RGB.  In the equations boxes below, you are going to specify the channels for the HARRIS layer (the "Destination" layer)  based on the channels in the RED layer (the "Source" layer).  In this step, we want to place the red channel from RED into the red channel of HARRIS, and leave the green and blue channels of HARRIS alone.  To do this, we enter the following equations:

DR = SR

DG = DG

DB = DB

That is, the Destination Red (DR) channel (the red channel of HARRIS) equals the Source Red (SR) channel (the red channel of RED).  Note that the DG = DG and DB = DB equations basically mean that the Destination Green (and Blue) equals whatever it already is (in this case, nothing).

3c) Repeat 3b for the GREEN and BLUE layers as sources for their respective channels in the HARRIS layer.  So, for the green channel of the HARRIS layer, make sure HARRIS is the active layer, select Filter > Apply Image..., drag the GREEN layer onto the Apply Image dialog, check the Equations box and enter:

DR = DR (leave red alone)

DG = SG (place the green from the Source [GREEN] into the Destination [HARRIS])

DB = DB (leave blue alone).

For the blue channel in HARRIS, drag the BLUE layer onto the Apply Image dialog - the equations will be:

DR = DR

DG = DG

DB = SB

Taa daaah!  This is a more elegant method, but if you do not understand how to use Apply Image, it can be very confusing.

Kirk

 

[David in Яuislip]

kirkt beat me to it

Here's a quick macro that does just that

It needs three images which must be rasterised Pixel layers. It copies the Red channel from the lowest layer, the Green from the middle, the Blue from the top.

Then it creates a new Pixel layer called Final, pastes the channels into that then deletes the spare channels

You'll get different effects by reordering the layers before running the macro

Hours of fun!

dcHarrisShutter.afmacro

[amunaptra2001]

you guys are awesome, thank you, I will try this later

[amunaptra2001]

So here's the results I found I had to load the source pictures from file. but everything else was the same 

[thomaso]

On 10/12/2018 at 12:46 PM, stitch said:

has anyone a recommendation on how to create an harris shutter effect in Affinity Photo?

In Adobe Photoshop is was pretty easy: Layer Style -> Advances Blending -> exclude different RGB channels.

If you exclued a channel in Affinity Photo it has not the same effect.

Wasn't Harris initially photographing with 3 color filters? In APhoto 3 fill layers might achieve the result quickly.

If the single images are properly isolated – as in your youtube sample – you don't need these masking (Rectangle) layers:

Affinity Publisher maybe easier, you just assign fill colors to RGB images and set them to blend mode Multiply:

 

 

[walt.farrell]

9 hours ago, thomaso said:

Affinity Publisher maybe easier, you just assign fill colors to RGB images and set them to blend mode Multiply:

That shouldn't require Publisher; Photo and Designer provide the same capability.

In all 3, an (Image) layer can be assigned a Fill color, and a blend mode.