Skip to main content
C
celinem41600497
Participant
February 6, 2018
Answered

Photoshop / displacement map unity of value

  • February 6, 2018
  • 2 replies
  • 2515 views

Hello,

I'm looking for the unity of value used by the displacement map tool in photoshop

I'm using this tool to create anaglyphs 3D and then i need to print those anaglyph but not as a single sheet. I need to print blue and red separately to make an installation afterwards.

So in an anaglyph the blue and red sheets are not exactly aligned and i need to know by how much the displacement map has moved them appart.

Using the tool you choose a value, let say '10' here, but there's no indication as to what those 10 refer to: is it % ? pixels ? something else ?

    This topic has been closed for replies.
    Correct answer davescm

    You are of course right but 200% just means 256 pixels .....etc

    Celine - if you want to check just make an image with a single pixel dot in the centre.

    Apply the displacement map with a white map  at 100% you will see the pixel move 128 to the left and 128 up. 200% does the same but moves by 256.............

    Dave

    2 replies

    davescm
    Community Expert
    davescmCommunity Expert
    Community Expert
    February 6, 2018

    Hi Celine - see here from Adobe:

    Apply specific filters in Photoshop

    It states the slider is a % value with the max displacement (at 100%) being 128 pixels

    Dave

    Semaphoric
    Community Expert
    SemaphoricCommunity Expert
    Community Expert
    February 7, 2018

    Also, the scale can range from -999% to +999%..

    C
    celinem41600497Author
    Participant
    February 19, 2018

    Hi
    Individual pixels are displaced by an amount set by the equivalent pixel in the Red and Green channels of the displacement map.
    In Semaphoric's example the image with gray and coloured squares was used as the displacement map, it also formed the background for the image above so that he could demonstrate the link. The displacement filter applied that map  to the layer with the black crossed lines - thereby moving the lines according to the values in the coloured boxes.

    Dave.


    ok but in this example the grey values used are both extreme of the grey scale: 0 and 255. So they move symmetrically in opposite directions, and by the same amount.

    What if i have a grey value of 34 and 166. They will be moved differently , is that correct ?

    Steve Werner
    Community Expert
    Steve WernerCommunity Expert
    Community Expert
    February 6, 2018

    Moving to Photoshop forum

    Terms & ConditionsAccessibility statement
    Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices