Originally Posted by nohal
KAP chart is nothing else but a TIFF with 2-127 color palette and a text header describing the chart and it's calibration. Starting with a PNG, you will not get a 100x smaller chart file, neither starting from PCX you get a 12x smaller chart file than if you start with a TIFF.
It would be a bit easier to suggest an "optimal" way to handle your chart portfolio if we could have a look at one of your PCX files...
Hi Pavel, I have had some more time to devote to this now.
I found a description of the process in an xls file that was given to me but it is very out of date.
The process so far - I am now working with an original .jpg that I have downloaded that has known reference LAT/LON to test the process. I am still having some issues that maybe more informed members could fix.
1. Copy original .jpg to working directory "Chart Conversion"
2. Use a program JpegOpt to compress the file. The link to this appears to be broken so have not managed to download it. Do I really need to do this?
I chose a small file 200kb to start with so ignored this for now.
3. Used Gimp2 to reduce the colours to a palette (16) and produce .png & .tif files.
4. Used Map Cal
II to generate geo-reference co-ords in a .dir file.
I now have:
ROU6.jpg - original
ROU6.jpg - working file (should be compressed see note above)
The header .dir looks like this.
When I try to run imgkap I get invalid header type ROU6.DIR
Any ideas where I am going wrong.
Once I have it achieved conversion. I think it would be good for me to write a simple procedure with an example that others can use.