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Quick Adobe Photoshop® Tutorials : Alter the quality of the Photograph | Change the Size of the image

You can change the size in 2 ways:

1. Scale the entire image manually using the selection tool

2. Scale the image size to a specific size

To get started, Start Photoshop, download this image to your hard drive, then open it in Photoshop® by choosing File/Open


Scale the entire image manually

This technique is helpful when you want to scale the image's proportions without worrying about altering the image's resolution.

1. The floating tools palette needs to be visible.

If you do not see this toolbar, select Window/ Tools. This will make the palette visible on the screen.














2. Select the Rectangular Marquee Tool in the Tools Palette. This is the top left button.

3. Select the image you wish to scale by clicking the mouse on it to make it active.

4. Starting in the top left corner of the image, with the rectangular marquee tool selected, hold down the left mouse button and drag the mouse across the image. The rectangle tool looks like a series of dashed lines around the image.

5. With the entire image selected, go to Edit/ Transform/ Scale. Now anchor points around the selection are visible.

6. Move the cursor over one of the anchor points in the corner of the image. Notice how the cursor turns into a double sided arrow.

7. Left click the mouse while the cursor is a double sided arrow and drag the mouse.

TIP: The scale the image proportionately, hold Shift while dragging the double sided arrow and left clicking.

Notice how the image is now being scaled within the area of the original size.

8. If you do not like how you have scaled the image, you may cancel the operation by pressing Escape on the keyboard.

If you do like the new scale of your image, press enter for the changes to take effect.

9. Notice that now our image is small but has retained the original size in the background.

We will need to crop the image according to the new proportion.

10. Select the crop tool in the Tools palette. It is the 3rd icon from the top in the left column.

11. Just as you used the rectangular marquee to select the image, you will use the crop tool to select the photograph.

You are selecting what you want to keep.

12. Start in the top left corner of the photograph and drag the crop tool to the bottom right corner of the photograph.

13. Press Enter. You now have a smaller version of the photograph with the same printing resolution.


Scale the image to a specific size

This technique is helpful when you want to scale the image to a specific size and change the resolution.

Download this image to your hard drive used above if you have not already done so

1. File/ Open image 12.jpg in Photoshop

2. Using the Zoom Tool, which looks like a magnifying glass, Zoom out to make the image a little smaller (Zoom tool + alt)

We are going to format this image in several different ways. First, we are going to change the resolution. Second, we are going to keep the resolution and change the physical width and height to a specific measurement.

Tip: Resolution should be adjusted to the format. If you are going to be using the image in a Power Point presentation or on the web, you should adjust the resolution to somewhere between 75 - 100 dpi. This is the resolution used for screen viewing and it also makes the file size smaller. To prepare your images for print, the higher the resolution the better. This is because printers are capable of producing a tighter, higher quality image than viewed on the screen. A good resolution for print is between 300 dpi- 600 dpi for ink jets and plotters.

3. To change the resolution, go to Image/ Image Size.

You will see in the pop up window, the Pixel Dimensions, which is the size in pixels when viewed on the screen. The document size is the printable dimensions on paper at the given resolution. The initial resolution is 300 dpi.

4. Change the resolution from 300 dpi to 100 dpi. Notice the print dimensions do not change but the pixel dimensions are scaled down. Press OK.

5. Now your image appears much smaller than before. Select the Zoom Tool and click on the image to zoom in.

At the top of the screen, next to the Photoshop title, you will see the zoom percentage.

6. Choose Edit/ Undo Image Size or File/ Revert to undo the sizing change. This resets the image back to its original size.

7. Now we are going to change the physical size without changing the resolution.

Choose Image/Image Size

8. Change the width of the pixels to 500 under pixel dimensions.

Physically, the image at resolution 300 dpi and the image at 100 dpi are the same on the screen and even the same file size. The difference between them is the print size. The print quality is compromised at 100 dpi, the 300 dpi image is much smaller but crisper.

Quick Adobe Photoshop® Tutorials