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Photoshop Contest Forum Index - New Users - Question concerning displacement water tutorial - Reply to topic

Post Wed Jun 25, 2008 7:01 am   Reply with quote         


I've got a question concerning Displacement Water Tutorial which is situated in on your site in tutorial section (I can't post a link because of flood protection here) so I'll post some quotations from the tutorial.
Quote:
The displace filter "shifts pixels" in an image according to the brightness values of a displacement map. You can use any .psd file as a displacement map (if saved with "Maximize compatibility"). Displace uses the first and the second channels of this .psd file for horizontal and vertical displacement respectively. Each channel is a grayscale image. Medium gray (brightness 128) does nothing. Darker values will shift an image in the positive direction (in Adobe coordinates). Brighter values cause a shift in the negative direction. The amount of displacement can be controlled separately. At a scale value of 100, the displacement measured in pixels is equal to 128 minus the brightness of the displacement map. For example, a white pixel will shift an image 128 - 255 = -127 pixels at the corresponding pixel at that setting.

1. Where can I displace the channels? What is medium gray? Where is it situated?
Quote:
We will use the result of the previous steps as a bump map to create a representation of the tilt of the surface. We will do this separately in channel 1 and channel 2. You can ignore channel 3. It does not affect the displace filter.

2. On my channels pallete I have channels named red, blue, green and RGB. In that case, what are channel 1 and channel 2? Where can I select them to do the manipulations describe in the lesson?
Quote:
Unlock the background layer.

3. How many layers do we use in this lesson? I thought we have only one background layer. And there was no step where we had to lock it. I've missed it. On which step should I lock the background layer?
Quote:
Fill with medium gray (brightness 128).

4. Where can I pick the medium grey to do filling up?

Thank you




MindGraph

Location: Augusta, Georgia

Post Wed Jun 25, 2008 7:13 am   Reply with quote         


Well I have to go through the tutorial myself as it's been a while but in the meantime here is the tutorial link Kevin is speaking of.... Wink
also what version of PS are you using?

http://photoshopcontest.com/tutorials/26/displacement-water.html




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Post Wed Jun 25, 2008 7:56 am   Reply with quote         


Photoshop CS2




MindGraph

Location: Augusta, Georgia

Post Wed Jun 25, 2008 8:00 am   Reply with quote         


ok...try and help you with what I can but tutorial is too long for my time right now.


2. On my channels pallete I have channels named red, blue, green and RGB. In that case, what are channel 1 and channel 2? Where can I select them to do the manipulations describe in the lesson?
The channels are identified as Red Green and Blue BUT if you look to the right side of the channels they are also numbered.

3. How many layers do we use in this lesson? I thought we have only one background layer. And there was no step where we had to lock it. I've missed it. On which step should I lock the background layer?
The background layer is locked from the start. If you look on the layer where it says "Background" it will have a little lock icon to the right of it.To unlock it you have to double click on that layer and name it layer 1 (it will come up as that so you should just have to click ok)

4. Where can I pick the medium grey to do filling up?
Make your medium gray in RGB (R 128, G 128 and B 128)
I'm a little confused with what your asking on your first question but I hope the other things I put in here help you. If not keep asking.
Good luck!




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TofuTheGreat

Location: Back where I belong.

Post Wed Jun 25, 2008 8:07 am   Reply with quote         


1. Where can I displace the channels? What is medium gray? Where is it situated?
Medium gray is just that. The grey point smack in the middle between white and black. You'll pull it from your color picker.

2. On my channels pallete I have channels named red, blue, green and RGB. In that case, what are channel 1 and channel 2? Where can I select them to do the manipulations describe in the lesson?
Channels, I believe, are numbered in this tutorial the same order that they are in. So RGB=123.

3. How many layers do we use in this lesson? I thought we have only one background layer. And there was no step where we had to lock it. I've missed it. On which step should I lock the background layer?
The "Background layer" is the default layer whenever you open an image in Photoshop and it's locked by default as well. So working on a photo directly requires you to unlock that layer. You can unlock it, and keep the original safe, by simply duplicating the layer and hiding the original "background" layer. This way you can start over if you hose your copy.

4. Where can I pick the medium grey to do filling up?

Again medium gray is 128,128,128 in the color picker. That's a value of 128 for each channel (red, green, blue).

Edit: DAMN YOU MG! You beat me to it and type faster! Laughing




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Why I do believe it's pants-less o'clock! - Lar deSouza
”The mind is like a parachute, it doesn’t work if it isn’t open.” - Frank Zappa
Created using photoshop and absolutely no talent. - reyrey

FootFungas

Location: East Coast!

Post Wed Jun 25, 2008 8:14 am   Reply with quote         


For medium gray, hit select something with lasoo, marquee, etc
right click the selection, select fill, and select 50% gray frow the menu.

Channels 1 and 2 are just the first two channels, in this case, Red and Green. It makes a difference if you are using a different color mode, I guess.

*edit* beat twice!!




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Look out behind you!

Post Wed Jun 25, 2008 9:15 am   Reply with quote         


Thanks to everybody, your help is really revealing Smile




TofuTheGreat

Location: Back where I belong.

Post Wed Jun 25, 2008 3:20 pm   Reply with quote         


MG's what is showing?




_________________
Why I do believe it's pants-less o'clock! - Lar deSouza
”The mind is like a parachute, it doesn’t work if it isn’t open.” - Frank Zappa
Created using photoshop and absolutely no talent. - reyrey

Post Sun Apr 29, 2018 1:43 pm   Reply with quote         


FootFungas wrote:
For medium gray, hit select something with lasoo, marquee, etc
right click the selection, select fill, and select 50% gray frow the menu.

Channels 1 and 2 are just the first two channels, in this case, Red and Green. It makes a difference if you are using a different color mode, I guess.

*edit* beat twice!!


This is a really old tutorial, but your reply is exactly what I needed. I looked all around the internet trying to figure out what channels 1 & 2 were. THANKS




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