PrintPartner

From Just Solve the File Format Problem
(Difference between revisions)
Jump to: navigation, search
(Created page with "{{FormatInfo |formattype=electronic |subcat=Graphics |extensions={{ext|gph}} |released=1990 }} '''PrintPartner''' is a desktop publishing program for MS-DOS. It was developed ...")
 
m (→‎Sample files)
 
(5 intermediate revisions by 3 users not shown)
Line 6: Line 6:
 
}}
 
}}
 
'''PrintPartner''' is a desktop publishing program for MS-DOS. It was developed by Acropolis Software, and released mainly as freeware. It has a native '''.GPH''' graphics format.
 
'''PrintPartner''' is a desktop publishing program for MS-DOS. It was developed by Acropolis Software, and released mainly as freeware. It has a native '''.GPH''' graphics format.
 +
 +
== GPH format details ==
 +
''This information is based on reverse engineering and guesswork. It may not be correct.''
 +
 +
File:
 +
{| class="wikitable"
 +
!Field name !! Type !! Details
 +
|-
 +
|ID/comments || char[] || ASCII text
 +
|-
 +
|ID terminator || byte || = 0x1a
 +
|-
 +
|image_sequence || Image[] || See below
 +
|}
 +
 +
Image:
 +
{| class="wikitable"
 +
!Field name !! Type !! Details
 +
|-
 +
|name_len || byte || Expected to be from 1 to 20.
 +
|-
 +
|name || char[20] || ASCII text, padded with spaces
 +
|-
 +
|cmpr_type || byte || 1=uncompressed, 2="RLE8", 3="RLE4"
 +
|-
 +
|height || byte || Image height in pixels
 +
|-
 +
|rowbytes || byte || width = rowbytes×8. The width is always a multiple of 8 pixels. Unused columns are expected to have all-white pixels.
 +
|-
 +
|image_data || byte[] || The size of this element must be calculated, in order to locate the next image. The way to do that depends on cmpr_type (see below).
 +
|}
 +
 +
=== Uncompressed format ===
 +
1 bit per pixel, white is 0. There is no header, or row padding. The size of the image_data element is height×rowbytes bytes.
 +
 +
=== RLE8 format ===
 +
This is a byte-oriented compression scheme. It has a 2-byte header containing the number of compressed bytes. Add 2 to this value to get the size in bytes of the image_data element. After decompression, the data is in the "uncompressed" format described above.
 +
 +
{| class="wikitable"
 +
! Code byte (N) !! Instructions
 +
|-
 +
|N ≤ 127 || Emit the next N bytes literally.
 +
|-
 +
|N ≥ 128 || Emit the next byte N−128 times.
 +
|}
 +
 +
=== RLE4 format ===
 +
This is a pixel-oriented compression scheme. There is a 2-byte header containing the number of 4-bit "nibbles". Each nibble encodes a run of white or black pixels. To calculate the size of the image_data element, divide the number of nibbles by 2, rounding up, and add 2.
 +
 +
Start with an all-white canvas.
 +
 +
{| class="wikitable"
 +
! Code nibble (N) !! Instructions
 +
|-
 +
|N ≤ 7 || Leave the next N pixels white.
 +
|-
 +
|N ≥ 8 || Make the next N−8 pixels black.
 +
|}
  
 
== Identification ==
 
== Identification ==
Line 15: Line 73:
 
** [http://cd.textfiles.com/swheaven1/GRAPHICS/PP20.ZIP PP20.ZIP] - v2.0-1992-08-03
 
** [http://cd.textfiles.com/swheaven1/GRAPHICS/PP20.ZIP PP20.ZIP] - v2.0-1992-08-03
 
** [http://cd.textfiles.com/ibmgopher/PRINTER/PP20.ZIP PP20.ZIP] - v2.0-1992-08-18
 
** [http://cd.textfiles.com/ibmgopher/PRINTER/PP20.ZIP PP20.ZIP] - v2.0-1992-08-18
 +
* {{Deark}}
  
 
== Sample files ==
 
== Sample files ==
 
* Some of the files at http://cd.textfiles.com/powerpakgold/GRAPHC_F/, such as [http://cd.textfiles.com/powerpakgold/GRAPHC_F/PP_ANML1.ZIP PP_ANML1.ZIP] - See the [http://cd.textfiles.com/powerpakgold/GRAPHC_F/DIRX.LST index].
 
* Some of the files at http://cd.textfiles.com/powerpakgold/GRAPHC_F/, such as [http://cd.textfiles.com/powerpakgold/GRAPHC_F/PP_ANML1.ZIP PP_ANML1.ZIP] - See the [http://cd.textfiles.com/powerpakgold/GRAPHC_F/DIRX.LST index].
 
* Some graphics are included with the PrintPartner software listed above.
 
* Some graphics are included with the PrintPartner software listed above.
 +
* {{DexvertSamples|archive/printPartnerGraphics}}
 +
 +
[[Category:Desktop Publishing]]

Latest revision as of 04:18, 28 December 2023

File Format
Name PrintPartner
Ontology
Extension(s) .gph
Released 1990

PrintPartner is a desktop publishing program for MS-DOS. It was developed by Acropolis Software, and released mainly as freeware. It has a native .GPH graphics format.

Contents

 [hide] 

[edit] GPH format details

This information is based on reverse engineering and guesswork. It may not be correct.

File:

Field name Type Details
ID/comments char[] ASCII text
ID terminator byte = 0x1a
image_sequence Image[] See below

Image:

Field name Type Details
name_len byte Expected to be from 1 to 20.
name char[20] ASCII text, padded with spaces
cmpr_type byte 1=uncompressed, 2="RLE8", 3="RLE4"
height byte Image height in pixels
rowbytes byte width = rowbytes×8. The width is always a multiple of 8 pixels. Unused columns are expected to have all-white pixels.
image_data byte[] The size of this element must be calculated, in order to locate the next image. The way to do that depends on cmpr_type (see below).

[edit] Uncompressed format

1 bit per pixel, white is 0. There is no header, or row padding. The size of the image_data element is height×rowbytes bytes.

[edit] RLE8 format

This is a byte-oriented compression scheme. It has a 2-byte header containing the number of compressed bytes. Add 2 to this value to get the size in bytes of the image_data element. After decompression, the data is in the "uncompressed" format described above.

Code byte (N) Instructions
N ≤ 127 Emit the next N bytes literally.
N ≥ 128 Emit the next byte N−128 times.

[edit] RLE4 format

This is a pixel-oriented compression scheme. There is a 2-byte header containing the number of 4-bit "nibbles". Each nibble encodes a run of white or black pixels. To calculate the size of the image_data element, divide the number of nibbles by 2, rounding up, and add 2.

Start with an all-white canvas.

Code nibble (N) Instructions
N ≤ 7 Leave the next N pixels white.
N ≥ 8 Make the next N−8 pixels black.

[edit] Identification

GPH files apparently start with some ASCII text that begins "PrintPartner Art".

[edit] Software

[edit] Sample files

Retrieved from "http://fileformats.archiveteam.org/index.php?title=PrintPartner&oldid=47259"
Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox