What image file formats are supported in PDF documents created within APPX?

Here are the image file types supported on PDF output;

PNG: PNG images which make use of interlacing,contain an alpha channel (which

will be lost anyway - we don't support alpha channels in PNG files),or
have 16 bit color depth will have to be uncompressed.

JPEG: APPX supports baseline JPEG compression which accounts for the vast

majority of JPEG images.  We also support progressive JPEG compression.


JPEG images can be packaged in several different file formats. We
support all common JPEG file formats, and will read resolution
information from the following types:


 - JFIF,which is generated by a wide variety of imaging applications.
 - JPEG files written by Adobe Photoshop and other Adobe applications.

GIF: Due to restrictions in the compression schemes supported by the PDF file

format, the entry in the GIF file called "LZW minimum code size" must
have a value of 8 bits.


Unfortunately,there is no easy way to determine this value for a certain
GIF file. An image which contains more than 128 distinct color values
will always qualify (e.g.,a full 8-bit color palette with 256 entries).
Images with a smaller number of distinct colors may also work,but it is
difficult to tell in advance because graphics programs may use 8 bits or
less as LZW minimum code size in this case,and we may therefore reject
the image.


The following trick which works in Adobe Photoshop and similar image
processing software is known to result in GIF images which are
accepted:


   load the GIF image,and change the image color mode from "indexed"
   to "RGB". Now change the image color mode back to "indexed",and
   choose a color palette with more than 128 entries (for example the
   Mac or Windows system palette,or the Web palette).


The image must not be interlaced.

TIFF: We support the following TIFF images:

compression schemes:
 - uncompressed
   CCITT (group 3,group 4,and RLE)
   ZIP (=Flate)
   LZW (with restrictions)
   PackBits (=RunLength)
   other compression schemes are handled by uncompressing.
color:
   black and white
   grayscale
   RGB
   CMYK
      any alpha channel or mask which may be present in the file will be
      ignored.


TIFF files containing more than one image


Color depth must be 1,2,4,or 8 bits per color sample (this is a
requirement of PDF).


Multi-strip TIFF images are converted to multiple images in the PDF
file which will visually exactly represent the original image,but can
be individually selected with Acrobat s TouchUp object tool. Multi-
strip TIFF images can be converted to single-strip images with the
tiffcp command line tool which is part of the TIFFlib package. The
Image-Magick tool always writes single-strip TIFF images. Some TIFF
features (e.g.,CIEL*a*b*color space,JPEG compression)and certain
combinations of features (e.g.,LZW compression and alpha channel or
mask, LZW compression and tiling)are not supported.