## Image File Formats

This chapter provides an overview of the image formats supported by PhotoZoom Pro 4, and their specifications.

Note that this overview concerns the stand-alone version of PhotoZoom Pro 4. The Automation Plug-in and Export plug-in versions can process a wider range of image formats, including PSD, EPS, and Raw formats. The Automation plug-in also supports HDR images. When using the Export plug-in, you can save your files only with a supported format (such as TIFF). The Automation plug-in does not have any such restriction.

Format: | TIFF | JPEG | PNG | TGA | BMP | GIF
Features:
Max resolution (pixels) | 1 million x 1 million | 32767 x 32767 | 1 million x 1 million | 65535 x 65535 | 32767 x 32767 | 32767 x 32767
Max file size | 4 gigabyte | 2 gigabyte | 16 exabyte | 2 gigabyte | 2 gigabyte | 1 gigabyte
Compression | yes1 | yes (lossy) | yes (lossless) | yes2 | yes2 | yes (lossy)
Color models:
RGB | yes | yes | yes | yes | yes | yes3
CMYK | yes | yes | n/a | n/a | n/a | n/a
Lab | yes | n/a | n/a | n/a | n/a | n/a
Grayscale | yes | yes | yes | yes | yes | n/a
Channel types:
8 bit channels | yes | yes | yes | yes | yes | yes
16 bit channels | yes | n/a | yes | n/a | n/a | n/a
Alpha channel | yes (multiple) | n/a | yes | yes | n/a | n/a
Profiles / metadata:
ICC profiles | yes | yes | yes | n/a | n/a | n/a
Exif profiles | yes | yes | n/a | n/a | n/a | n/a
IPTC profiles | yes | yes | n/a | n/a | n/a | n/a
XMP profiles | yes | yes | n/a | n/a | n/a | n/a

n/a: This option is not supported by the image format.
1: The TIFF format supports both lossless and lossy (JPEG-based) compression. When saving images as TIFF, you can choose what kind of compression you prefer.
2: The format supports run-length compression. PhotoZoom Pro 4 can open them, but saves uncompressed images.
3: The GIF format supports palette colors only, and is typically used for low-quality (256 color) images. PhotoZoom Pro 4 can open GIF images (and treats them as RGB), but does not save them as GIF.