FAQ's - APPX Software, Inc. : APPX Utility : APPX Development Environment : Other Application Design Questions :
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.
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.
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