Page images represent the content of a page and act as page background. Other “elements” (video, audio, images, links) can be added later.

A click on Commands - Add Page Images opens the Add Page Images, where options to open specific folders are offered.
Once images are selected (see Select Page Images), they can be assigned to pages (see Assign Page Images to Pages)

In case you are building your Mz3 Book based on a PDF file and the Convert PDF command was performed, page images representing the PDF-pages are have been created automatically and saved in the respective “image-type folders”; with file names containing the target page number in the file name.
Example: page_00012_en.jpg

But No page image was assigned to pages yet. This is done in the “Add Page Images” PopUp WIndow), where you select the folder with images of the type you intend to use (JPG, PNG or SWF).
If you close this automatically opened window after a PDF conversion without adding Page Images, the pages remain unchanged, i.e. empty.
You then have to open that window again via the Add Page Images command again to finish the process and Assign Page Images).

Create Page Images out of PDF Files

If the Mz3 Book is based on one or several PDF files, those page images usually are built during the PDF step.
Every single page of the PDF will be converted into a Page Image; as three different image types: JPG, PNG, and SWF.

  • JPG
    In the case of JPG images, the bitmap data is compressed. The PDF Conversion Window supports the selection of different compression rates. The higher the compression, the smaller the file size. But quality decreases also.
    JPG images are ideal for photos and similar images, but small text will be hard to read, and if zoomed in the pixels the text is built off become visible. Standard and big font sizes might be converted with acceptable quality, if not compressed too much.
  • PNG
    The converted bitmap is not compressed so the files are bigger than jpg files. But text quality improves. Small fonts can be better read than in jpg images. PNG files are a good fit for pages with a lot of text and no images; or with a small percentage of area with images.
  • SWF
    This is a special format mostly used by Adobe programs; in the past predominantly by FLASH. Images are embedded as JPG images, and text in vector format. characters are not saved as bitmap images but defined as vectors, i.e. lines of a certain direction, length, width, and color. Those vectors are converted into pixels only when text is output, e.g. on a screen.
    The big advantage is better scalability. If zoomed in, even with very high zoom factors the text is extremely sharp without visible pixels. This makes SWF files an ideal format for typical PDF content: excellent quality and small file size.
    Disadvantage: The SWF file format is not a browser standard, and after FLASH more or less is banned and will become unsupported end of 2020, most browsers restrict more and more the use of FLASH. On smartphones was never supported (besides by some niche products).
    SWF files are supported by Adobe’s ActionScript3 (AS3) language, offering development of multi-platform solutions. AS3 is mostly used for game development; one of the core competencies of Adobe nowadays.
    MegaZine3 Viewer and mz3Tool are based on ActionScript3 and support SWF files.

Page Images from any JPG or PNG Image

If no PDF file is available but images in JPG or PNG format can be provided, any such image can be used as page image and put on empty pages.
The source of such images does not matter: camera photos, scanned documents, pages designed with programs like Word, InDesign, Photoshop, Corel Draw, Quark or alike can be used.
Those images should “fit” for the book pages, i.e. the aspect ratio of the images and pages should be the same or very close, so the content of the image is not distorted when scaled to fit the page.
To achieve good qualities the image size should be close to or bigger than 1000 px *1000 px.

Last modified: 2018/11/19


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