SAVING

Photographs that come from your digital camera will be JPG (or jpg) images ... JPG is the file type.

Recognizing the file type is important, especially for images, as we will explain below. If you open a folder of your images and you can only see names and not file type endings (img008 instead of img008.jpg) you should turn on this feature. Open any folder and from the menu at the top, choose Tools and then Folder Options. When a window appears, click on the View tab, and then scroll down to the line that says 'Hide extensions for known file types' and make sure this line is not checked.

Every time you open a jpg image and resave it, it becomes more fuzzy. When editing a photo that you plan to work on some more later, you should save it as a bmp image rather than a jpg ... bmp images don't degrade when you save them. Use 'save-as' in order to change the file type.


Above left, saving as a jpg image (more about this later). At the right above is saving an image using 'save as' and changing the file type to bmp in the 'Format' box. You must change the file type this way; you can't convert a jpg image to a bmp just by renaming it.

Bmp images are mostly used to keep an image sharp between editing sessions. The final step is always to convert a bmp image to a jpg, as these take up less room in your computer and are the file type needed for printing and using on websites.


If you're only editing once (cropping, etc) in order to produce print-ready photos, you'll want to make sure the new jpg image you save is of the highest quality. This is important.    Jpg images are compressed to save space, and you can control the compression. If you don't choose maximum quality (the least compression) your prints will be fuzzy.

After you've cropped your photo and made whatever other changes you want, save the new version.    Choose 'Save as', and when the window appears, make sure the 'Format' box says 'jpg'. Give this newly edited photo a different name than the original, so that you'll still have the original picture. (Alternately, you can save it in a different folder, perhaps one called 'Edited Photos').

Now click on the 'Save' button. You'll see the dialogue window at the right appear. Change the quality to 12 Maximum, either by entering the number or using the box to the right of the number.

This will ensure that your edited photo will be print-quality.


Are you wondering why you would ever choose a lower quality to save a picture? Have a look at the photo just above, under the word 'Preview'. The number you see (105.3 K) is the amount of space this photo will use up on your hard drive ... the file size of the image. It's also a measure of how long the photo will take to download if used on a website ... a smaller number means faster downloading. Webpages with lots of photos take a long time to download on a dial-up connection, so it's generally been the practice to lower the quality slightly to get faster-loading pictures. That's why website photos you save don't make good prints. This is becoming less important as more homes get high-speed internet.

Using Photoshop


Computers | Science & Math | Worsley School