How to change the size of a photoshop psd ?

Hi,I have some templates of US business cards that I need to change to european sizes. Let's say the US size is 9cm*5cm and I want it to become 8cm*5.5cm (example sizes). What I need is to change the size of the layers inside the psd (not change a jpeg or png size). So is there a way to change the size of the whole photoshop working space, with it keeping proportions for fonts images etc, while not cropping the working space?Thanks !

LOL...............if you will change the aspect ratio then the format will be distorted so it is not possible to change .psd size without croping any side of that card......

1 . Select the layer which you want to resize2. Press Ctrl + T (for windows) , if non windows look for shortcut for re-size in help3. At the top left , you can see the size in cm or Drag on corner handles (hold Shift button to constrain proportions) 4. Double-click inside to commit

1. go to image.2. image size.3. specify the size you want.

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What you're asking is 2 different questions.1. DESIGN SizeIf you want to change the design's size from 9x5cm into 8x5.5cm, you have to change the proportions of the canvas size. Cut the width and enlarge the height.Image -> Canvas Size -> Type the sizeLAYER Size:If you want to resize only the content of a layer, click on the layer you want to change.Edit -> Transform (or simply use Ctrl+T)To constrain proportion click and hold "SHIFT" while you're resizing from the "corner points", otherwise it'll get distortion.Or you can type the size of at the left top, click the chain icon between W and H for proportional transform.2. FILE SizeIf you want to change the size of the whole Photoshop working space without cropping, it means you want to resize the File's size (like from 3 MB to 2MB or others). There are three ways:>>1. Image -> Image Size -> Change the size on width or heightCheck the box on "Constrain Proportion" bellow (make sure the chain icon between width and height is on to constrain proportions)>>2. Image -> Image Size -> Change the "Resolution" (known as "dpi") (300 dpi is good quality, 150 dpi is ok, 72 dpi is low quality)>>3. Save as a copy of PSD [Flatten, no layers] or Save as JPEG ->"Quality" between 0-12 or if needed you can change "Format Option" Baseline Standard is the default for normal use, Progressive is the highest.PS:I actually prefer using Adobe Illustrator or Corel Draw for corporate designs with less photographic images. (^_^)