This chapter is from the book
This chapter is from the book
This chapter is from the book
Steps Involved in This Project
Susan can work entirely from within Acrobat's Picture Tasks plug-in to create the presentation as well as different print versions of her images. She can also e-mail the presentation right from Acrobat.
First, she plans to import the images into Acrobat in a binder, or combined PDF document. After using the Picture Tasks' features, she'll have a slideshow complete with a title, slide transitions, and music.
To create her slideshow, Susan needs to
- Import the group of images into Acrobat, where they are converted to PDF
- Open the Picture Tasks' Export to Slideshow dialog and configure the slide-show's contents, adding a title, transitions, and music
- E-mail the slideshow PDF to her client
You can work with a range of image formats in Acrobat. Susan is working with JPEG images, so we'll focus our discussion on that format.
Working With JPEG Images
JPEG (Joint Photographic Experts Group) is a file format often used with grayscale or color images, including photographs. It is a type of compression, which means the file size is reduced by combining the pixel content in different ways.
JPEG compression is called lossy compression because it removes image information from the file to make the file smaller in size. The compression process increases the size of pixels and applies a mathematical formula to approximate the color in each larger pixel. As a result, the quality of the image can be reduced. It's important to strike a balance between the file size and the quality of the image.
Acrobat uses five levels of JPEG compression. Image quality and file size are inversely proportional. That is, the higher the quality of the image, the larger the file size; the lower the quality, the smaller the size.
Both high and maximum compression levels produce very clear, crisp images. On the other hand, Minimum and Low levels can be distorted and display a boxy appearance. Sometimes the distortion is so great it's difficult to determine what is in the image ( Figure 3.2 ).
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Figure 3.2 Although you may get a small file size, an image can become unrecognizable if compressed too much.