Snap to tiff converter (sna2tiff)

SNAP TO TIFF CONVERTER by Conor McMenamin (C.S.McMenamin@sussex.ac.uk) PROGRAM: sna2tiff is a simple C program which extracts the screen image from a ZX Spectrum memory snapshot and converts it into a TIFF (Tagged Image File Format) file. TIFF files can be read by most image viewing programs (eg xv on Unix, GifConverter on Macintosh, Cshow on PC etc.), and can also be used in some word processing/DTP packages. The images produced conform to Baseline TIFF 6.0, and are uncompressed palette colour (16 colours) images. Without a border, each output TIFF file should be 25088 bytes in size. USE: The program expects the name of a single snapshot file on the command line, as the first non-option (i.e. not preceeded with a '-') argument, and will use the second argument of this type (if one is supplied) as the name of the output file, if one is supplied. If only the name of the snapshot is passed to the program, a output filename will be created by knocking the suffix(if any) off the snapshot filename (eg .sna, .z80), and appending '.tif'. WARNING: If you wish to get TIFFs from multiple snapshots, do each one seperately or use a batch language file. Specifying multiple snapshots on the command line will cause the second named file to be trashed and replaced with a TIFF from the first! OPTIONS: The program defaults to a conversion from the .sna format used by JPP, but other formats may be specified by a command line option: -z for Z80 format snapshots -s for straight screen memory dump (I have never seen one of these, but someone asked about converting them on comp.sys.sinclair once). There is also support for including the border in the TIFF; the colour can be read from .z80 and .sna files. To specify a border, use the -b<n> option, where <n> is an optional single digit integer giving the border width in characters (8 pixels). If no <n> is supplied, the border will be two characters (16 pixels) wide. Examples: sna2tiff jetpac.sna (produces jetpac.tif, with no border) sna2tiff -z -b6 elite128.z80 (produces elite128.tif, with a 48 pixel border) sna2tiff elite128.z80 image.out -b -z (produces TIFF in image.out with a 16 pixel border) N.B. Options should be grouped together either before or after the filename arguments. CREDITS: Many thanks to Fredrik Ekman, Filip Kujawski, Colin Meeks and especially Russell Marks for helping with the devlopment, testing and (in Russell's case) coding style of this program. Thanks again to Russell for supplying the DOS executable. --------------------------------------------------------- This is the ArcaOS - OS/2 version of SNA 2 TIFF, a screen extractor for ZX Spectrum .SNA memory snapshots. This C program can extract a screen dump from a ZX Spectrum snapshot file creating a TIFF imaged file which can be afterwards seen and edited from your favourite OS/2 image editing software. Instructions to use this program are included in the SNA2TIFF.TXT file. I've just recompiled it with GCC 9.2.0, so YMMV and I can't guarantee for the data integrity of any snapshot you will use (but I didn't see any malicious algorithms in the included C code, so you may feel safe using it). If you feel my work is useful somehow, please drop a note at mentore.siesto@alice.it or on my social network channels like instagram, facebook or threads - you will find me for sure searching for my complete name and surname ;) Happy emulating Mentore