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6. Thumbnail Options allows some control over the size and quality of the images that get created. We'll leave the Resize Speed at Quality. When the Maintain aspect ratio box is checked, two more options appear: Force Width and Force Height. These two options are mutually exclusive. I have checked the Force Height option and set the Maximum Width/Height to 100:
Here's how these settings work: Maintain aspect ratio will keep the thumbnail in perspective. If the original image is 400 x 300 pixels, the thumbnail will keep the 4:3 size relationship. By setting the max Width/Height to 100, it indicates that whichever is larger of the Width or Height cannot be bigger than 100 pixels. So, with the 400 x 300 example, the thumbnail would be 100 x 75 pixels. By checking the Force Height box, it indicates that B.T. should make the height of the thumbnail 100 pixels no matter what, and the width will be adjusted to keep the aspect ratio. Using the same example of 400 x 300, the height would become 100, and the width would be 133 pixels. By the same token, if the original image is smaller in both dimensions than the Max W/H, the thumbnail will end up being larger than the original image. If the original image was 90 x 75 pixels, the new width would be 120 and the new height would be 100 because we said to force that height.
I like to maintain the aspect ratio of the thumbnails I create.
7. That's all the changes on this screen, so click the Next button. You are then at the Confirmation screen which shows all the settings you have chosen. Leave the jpg compression at 90 and allow files to be overwritten (the thumbnails are going into a new directory so there won't be any files to overwrite). You can now click the green GO button to start creating the thumbnails.
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