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Portland Camera Club
Isle of Portland, Dorset, United Kingdom
Resizing for Projection

General Notes

For our Club Competitions, we use a projector which has a resolution of 1024 by 768 pixels. This is why we ask for digital images to be no wider than 1024 pixels and no taller than 768 pixels.

When resizing for projection, you need to consider the image format:-
- for landscape format, change the Width to 1024;
- for portrait format, change the Height to 768.

Be careful with square-crop or unusually-cropped images. Always check that the resulting Width AND Height are both within the limits. If changing one dimension leaves the other too large, simply go back and change the other dimension instead.

Most cameras have either a 3:2 or 4:3 aspect ratio. For an uncropped 3:2 image, a landscape should resize to 1024x683 and a portrait to 512x768. Likewise, a 4:3 image would resize to 1024x768 in landscape format and 576x768 in portrait format.

Always be sure to maximize one of the dimensions so your image fills the screen as much as possible and resize with the aspect ratio preserved to avoid distortion.

After resizing, it is often necessary to apply a little sharpening (if you can) as the image will usually look softer.

Remember not to overwrite your original file – save it under a new name.

 

Picasa

Select your photo with a left-click, then choose “File->Export Picture to Folder” from the menu which brings up a pop-up window.

Note the “Export Location” which usually defaults to something like your “My Pictures\Picasa\Exports” folder. Below is the suggested sub-folder to place your resized images in.

Make sure “Resize to:” is selected.

Note that Picasa will adjust the larger dimension to the value you ask for rather than the width or height specifically.

For landscape format pictures, simply set the slider to 1024. If your picture is in portrait format, click in the box and type in 768.

Ensure the “Add Watermark” box is not selected when producing competition entry images.

Press the “Export” button which should then produce a resized copy of your image and open a Windows Explorer at its location.


Photoshop Elements

Open the image and choose “Image->Resize->Image Size” from the menu which opens a pop-up window.

At the bottom, make sure “Constrain Proportions” and “Resample Image” are both ticked.

Under the “Pixel Dimensions” section at the top, you can now edit the values for Width or Height as required. Don't worry about any of the numbers in the “Document Size” section.

Either change Width to 1024 or Height to 768, as appropriate, and the other value will be automatically scaled in proportion.

Now click the “OK” button, sharpen if needed, and save the resized version with a new name.


Paint Shop Pro

Open the image and choose “Image->Resize” from the menu which opens a pop-up window.

Ignore values in the “Print Size” section, and below in the “Pixel Dimensions” section, choose “Pixels” from the drop-down menu on the right as opposed to “Percent”.

You should now be able to click on and change the “New” values for either Width or Height with the other value automatically scaled so long as “Lock Aspect Ratio” is selected in the Advanced Options.

Now click the “OK” button, sharpen if needed, and save the resized version with a new name.


Various Email Programs

Some email programs will only give you the option to send an image as an attachment which would need to be the right size already.

Other email programs may let you send an image and give you the chance to resize it. However, they are often quite restrictive and only give you a few fixed choices of output size such as “Small JPEG”, “Medium JPEG” or “Large JPEG” for example.

These are best avoided as you get very little control, but you could experiment and email the image back to yourself in order to see what it will do by looking at the result.



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