GROB
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== Sample files == | == Sample files == | ||
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=== Binary === | === Binary === | ||
Latest revision as of 17:48, 28 December 2023
GROB is a (usually) bi-level raster graphics format associated with HP-48 and HP-49 series calculators.
There are two ways to encode a GROB image: "binary" and "ASCII". Sometimes, GROB images are also ASC-encoded.
Contents |
[edit] Format details
Binary format has an 18-byte header, followed by the pixel data.
[edit] Grayscale images
Although the format only really supports bi-level images, some images are intended to be interpreted as grayscale with 2 bits/pixel (or perhaps more). The physical image consists of the bit-planes stacked vertically. Unfortunately, there does not seem to be any way to detect whether this is the case.
[edit] Identification
A binary GROB file begins with "HPHP48" or "HPHP49", and has bytes 1E 2B at offset 8.
ASCII format apparently begins with "GROB ". An ASCII GROB might be embedded inside a script, or preceded by a "%%HP" header line, so it won't necessarily start at the beginning of the file.
[edit] Software
- Konvertor
- XnView
- grob.to.bitmap
- grob2eps.c
- My HP48 and HP49 software → hp48-mf-0.6.zip → hp48.dtx → grob2eps.c
- Farbfeld Utilities
