ImageGear Professional DLL for Windows
Reading and Writing Gigabyte-Sized Image Files

The two most important factors in image file formats that affect their ability to support gigabyte-sized images are as follows:

Although some file formats allow storing gigabyte-sized images, particular software may have difficulties with reading or writing them.

The table below lists some of the popular file formats and their capabilities for storing gigabyte-sized images.

Image Format

Max Available Image Dimensions (width x height, pixels)

Max Image Size, When Uncompressed, Approximately (for a 24-bit RGB image)

File Size Limit, Approximately

JPEG, EXIF JPEG

65535 x 65535

 

12 Gb

None

TIFF, EXIF TIFF

2^32-1 x 2^32-1

3 * 2^24 Tb

4 Gb 1

JP2,JPX

2^32-1 x 2^32-1

3 * 2^24 Tb

None 

PSB

300 000 x 300 000

250Gb

None

PSD

30 000 x 30 000

2,5Gb

4 Gb

BMP

2^31-1x 2^31-1

3 * 2^20Tb

4 Gb

PNG

2^32-1 x 2^32 - 1

3* 2^24Tb

None

DICOM

65535 x 65535

 

12 Gb

2 Gb

PBM / PGM / PPM / PNM

None

None

None

TGA

65535 x 65535

12 Gb

4 Gb

1 TIFF format uses 32-bit unsigned integers to store data offsets and sizes. As a result, a strip of pixel data in a TIFF image cannot be stored at an offset greater than 4 Gb, and its size formally cannot be greater than 4 Gb. Thus, the size of the largest compliant TIFF image can be a bit less than 8 Gb. This assumes that two strips of nearly 4 Gb size are used.

ImageGear supports the reading and writing of single-page, single-strip, single-tiled uncompressed TIFF images where strip byte counts are greater than 4 Gb. If the size of a strip exceeds 4 Gb, ImageGear writes 0 to the StripBytes tag. The reader can calculate strip size from image dimensions in such a case.
Note, though, that such files are formally incompliant and may not be supported by other readers.

When writing a gigabyte-sized TIFF image, make sure to keep the “IMAGE_BEFORE_IFD” TIFF control parameter set to its default value of FALSE.

 

 


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