How to resize layer in percentage relative to image size?

Hi,
Say I have an image that is 100x100 pixles. And I want to take one of the layers and resize it to 50% of the image size, so that it is 50 pixles. How can I accomplish that?
The reason I ask, is that have multiple images all with different size. But I have a signature (ie. watermark) that is always the same size. I want to be able to place this signature, and then resize it to XX% of the image it was placed on. That way, it should always have the same proportions.
Thanks in advance!

You can scale by percentage of the original layer size going to Edit > Transform > Scale. In the transform options menu, there is an option to scale by percentage - just make sure that you click on the link icon between the Height and Width fields to maintain the aspect ratio of your layer.
However, if you wanted to scale a layer relative to the canvas size, I think you would need to do some scripting or use actions... you might want to ask around on the Photoshop General Discussion or Photoshop Scripting forums to see if anyone has a solution.
Kendall
(Edited - misinterpreted original question)

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Scale a layer so it matches the image size. (Automate)

I need to scale a layer so it matches the image size.
The problem is that i need to automate this procedure and apply on a range of images all with different resolutions. (This is why i can't use CTRL+T and just drag the corners of the layer so it fits the image)
The layer that i need to resize is 2000x1500 pixels.
The images that i need the layer to match varies between 3000x2000 pixels and 5000x4000 pixels. (I know all about quality loss when i scale UP so please don't give me a lecture this).
It doesn't matter if the layer proportions changes.
I use Photoshop CS5.

jojonsson wrote:
I need to scale a layer so it matches the image size.
The problem is that i need to automate this procedure and apply on a range of images all with different resolutions. (This is why i can't use CTRL+T and just drag the corners of the layer so it fits the image)
The layer that i need to resize is 2000x1500 pixels.
The images that i need the layer to match varies between 3000x2000 pixels and 5000x4000 pixels. (I know all about quality loss when i scale UP so please don't give me a lecture this).
It doesn't matter if the layer proportions changes.
I use Photoshop CS5.
You state layer but do not state much more. Do you know how many layers these files will have. Will it always be the same layer in the layer stack that needs to be transformed. You state that it doesn't matter if the layer proportions changes by that do you mean you don't care if the layers aspect ration changes and its content becomes very distorted. Layer also supports transparency they need not be a rectangle transforming these layers will not fill in the transparent area or make the rectangular.
You may be able to automate this with a script. Install the ScriptListener and perform the transformation you want to do is steps. Use Ctrl-T set the anchor point to the top left corner and move the layers top left corner to the canvas's top left corner by entering 0 in the x and y fields . Then do a Menu Image size just to get the width and hight of the canvas in pixels and to make sure that the transform is written to Photoshop's script files. Then do a Ctrl-T again with the anchor point top left set the w and h fields to the width and height pixel sizes of the canvas. Also record these steps i an action so you can see how Photoshop does the transforms. You will see Photoshop records the steps and the value he used for the move to Top Left corner were calculated from the Layer original location. You would need to make this same calculation in the script. Un install the plug-in and extract the transforms steps from the Photoshop script files you may now have the information you need to do the transforms you will still have to learn Photoshop scripting to learn how to get document canvas sizes and layer sizes and process the layers. Not an easy task.....

How can I set up a repeatable bulk image size reducer?

How can I set up a repeatable bulk image size reducer?

File > Scripts > Image processor. It's pretty straight forward.
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Canvas size relative to Image size

I'm using Photoshop Elements 5.0. Windows XP. First post to this forum.
I'm trying to add a frame in artwork. When I add the frame, is the image resizing or the canvas resizing? In former post: http://www.adobeforums.com/webx/.3c05a367 they suggest to crop the image. However, when I do that, I'm resizing my image. How do I add a border without losing resolution or making my image smaller?

Glenda,
Glad that it helps with your project.
There are 2 concepts involved, as I see it.
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Let us assume that you open a picture file from your camera with
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height=23.7787 inches
resolution=72/px/in. Note that this metric is in inches, not pixels, for this drill.
now change resolution to 325px/in. Then
height=7.04 inches
width=5.268 inches
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Unless there is important information at the edges of the picture (e.g.a sign), it is my experience that application of the frame is not deleterious. Note that in the layers palette there is an f icon in a circle. Double click this to adjust the bevel. Layer>layer styles>scale effects is an option which is quite handy.
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Relation between image size, resolution and pixels

I would like to increase the size of image by using PSE9.
For sample existing image had: width (W) 6.073", height (H) 7.683", resolution 300, pixels W 1822, H 2305.
A situation) when I changed the image to W 8, H10 and click on RESAMPLE the resolution on changed but number of pixels increase to W 2400 and
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In my understanding if image blow up the number of pixels will be same as original and only the distance between pixels will be increase. So, resolution should
be dropped.
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More realistic looks sample B.
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Is it right?
What is wrong or right in above explanation?
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A. Resample means elements adds pixels to the existng pixels to increase image size
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Elements uses the resampling method choosen in the image size dialog to determine how,
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http://kb2.adobe.com/cps/331/331327.html
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> At present I have 4 separate actions set up do do this so I am running the batch process 4 times to get this result, is it possible to combine multiple actions into a single batch process?
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http://urandom.ca/nosquint/
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I am brand new to anything PhotoShop. I have created a talk balloon that I plan on putting it on a photo. I have the text on it already. However, the area outside of the balloon must be tranparent. I made it transparent pixel by pixel. There must be an easier way. So my two questions are:
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How to resize layer in percentage relative to image size?

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