Imgkap - kap File Converter Tool

[HappySeagull]

M'dJ,That was fast work!and GOOD work1.11 works better!extracts and rebuilds well!I'm going to do some more testing.

I updated my scripts
imgkap_AUTO_Rebuild.doc
imgkap_Extract2Edit.doc

For birds like me
these are for building,extracting and rebuilding quickly without overwriting important stuff!
Have them in the folder with imgkap with the image and/or kaps .
and change from .doc to .bat
Double-click and go.
You can only have one "EX" on deck at a time.Hide any others from the Autorebuild script.
(Edit out all the blather if it bugs you!
and change outputs too,etc)

[MdJ]

Originally Posted by HappySeagull

I rewrote the helpfile for myself.A bunch of easy notes I'm afraid I'll forget without it!might help others?
Attachment 27505

might be out of date now with newest version!

I think, you tan write on MS-DOS> or Shell> imgkap without argument.

Produce on screen :

ERROR - Usage:\imgkap [option] [inputfile] [lat0 lon0 lat1 lon1 | headerfile] [outputfile]

imgkap Version 1.11 by M'dJ

Convert kap to img :
imgkap mykap.kap myimg.png : convert mykap into myimg.png
imgkap mykap.kap mheader.kap myimg.png : convert mykap into header myheader (only text header kap file) and myimg.png

Convert img to kap :
imgkap myimg.png myheaderkap.kap : convert myimg.png into myimg.kap using myheader.kap for kap informations
imgkap myimg.png myheaderkap.kap myresult.kap : convert myimg.png into myresult.kap using myheader.kap for kap informations
imgkap mykap.png lat0 lon0 lat1 lon2 myresult.kap : convert myimg.png into myresult.kap using WGS84 positioning
imgkap -s 'LOWEST LOW WATER' myimg.png lat0 lon0 lat1 lon2 -f : convert myimg.png into myimg.kap using WGS84 positioning and options

Convert kml to kap :
imgkap mykml.kml : convert GroundOverlay mykml file into kap file using name and directory of image
imgkap mykml.kml mykap.kap: convert GroundOverlay mykml into mykap file

WGS84 positioning :
lat0 lon0 is a left,top point
lat1 lon1 is a right,bottom point
lat to be beetwen -85 and +85 degree
lon to be beetwen -180 and +180 degree
different format are accepted : -1.22 1°10'20.123N -1d22.123 ...
Options :
-n : Force compatibilty all KAP software, max 127 colors
-f : fix units to FATHOMS
-s name : fix souding datum
-t title : change name of map
-p color : color of map
- Kap to image color : ALL|RGB|DAY|DSK|NGT|NGR|GRY|PRC|PRG
ALL generate multipage image, use only with GIF or TIF - image or Kap to Kap color : NONE|KAP|MAP|IMG
NONE use colors in image file, default
KAP only width KAP or header file, use RGB tag in KAP file
MAP generate DSK and NGB colors for map scan (< 64 colors) Black -> Gray, White -> Black
IMG generate DSK and NGB colors for image (photo, satellite...)

I modify this any version.

To make a text file, just write Shell>imgkap 2>myfile.txt and in MS-DOS>imgkap > myfile.txt (or same Shell ?)

M'dJ

[HappySeagull]

Originally Posted by MdJ

Version 1.11 same as 1.1

Now option "-n" is modified to force KAP begin at colors 1 (max 127).

You can use -n option with all other option to produce KAP file

HappySeagull, try with VisNav...
> imgkap first.kap -n result.kap

Regards

three colours works,two colours does not. -n didn't help
here's visnav+kapview




to try:

imgkap TestChartPalette2colours2.png 49.506478 -124.838820 49.480322 -124.772093 -n
imgkap TestChartPalette3colours.png 49.506478 -124.838820 49.480322 -124.772093

[HappySeagull]

But it's much better!who makes a map with two colours?

[MdJ]

Originally Posted by HappySeagull

But it's much better!who makes a map with two colours?

For error with two or three colors.

One celebrity in French of strange (bizarre in French) :

Watch Bizarre, Bizarre Online - VideoSurf Video Search

M'dJ

[HappySeagull]

Originally Posted by MdJ

For error with two or three colors.

One celebrity in French of strange (bizarre in French) :

Watch Bizarre, Bizarre Online - VideoSurf Video Search

M'dJ

Oh,and imgkap1.11 works fine with the black+white chart posted above in thread.I extracted ,rebuilt .. and did that yet again.It Works!

ps: no error with 3 colours..."beezair-rr?"or what?

[HappySeagull]

M'dJ ,per post 107-I'll try that!Thanks!

[HappySeagull]

...The reason for all that...was to colourize the B+W chart,which I could not do before without trouble but now it's easy ..see?


much easier to read this chart now!

[HappySeagull]

My next imgkap project:
create images to match input lat/lon corners without screen grabs....The arithmetic has use per kmls? and per borders, in the header ...ie:writing refpoints?
so far,I have:
((lat1-lat2)/cos((lat1-lat2)/2+lat2))*(imageXpixels/imageYpixels)+/-lon1=lon2
or a variation depending on N/S,E/W positions...
and it works...at least, a kap comes out per the dimensions image dimensions..

I am guessing, in the formula above that for Mercator, an averaged mid latitude is the cos to use but I should check this...the lowest lat might be best and it seems to work as well and is simpler...hmm?

lon1-((lat1-lat2)*(cos(lat2))*(imageXpixels/imageYpixels)=lon2

I'm editing an actual formula as a general version here so forgive mistakes?brackets etc.

[MdJ]

Originally, when testing google images, I found significant errors in width and height of images, the reason is the projection. Mercator projection takes into account the elliptical earth.

The difference gave offset sometimes by several nautical miles.

The latest version of OpenCPN fixes this, but I prefer to keep my code who enlarged the image based on the elliptical with the following calculations:

WGSexentrik 0.081819

lontox (lon) return (lon * PI/180)

lattoy_WS84 (lat)
(
e = WGSexentrik;
sinl s = (l * M_PI/180.0);

return log (tan (M_PI / 4 + l * M_PI/360) * pow ((1. - s * e) / (1. * s + e) e / 2.));
)

W = lontox (lon1)-lontox (lon0);
ly = lattoy_WS84 (lat0)-lattoy_WS84 (lat1);


Then in the code, I adapt the height and width of the image to have the same relationship between lx and ly.

Imgkap, does not currently designed to transform the different projection, the goal is to process the images and converting to or from KAP.

I think it would work with GE2KAP or How to overlay NOAA raster charts in Google Earth | My marine electronics blog which is based on gdal.

M'dJ

[HappySeagull]

Yikes!
That's about all a seagullcan offer to that!!

except,
a QUESTION for you M'dJ:
"Imgkap, does not currently designed to transform the different projection, the goal is to process the images and converting to or from KAP."

So,
when a Polyconic is extracted and rebuilt from header with IMGKAP,the new kap is still Polyconic....?
It seems to be.It says it is....I haven't looked really closely at this yet,except that it looks very well and waypoints match pretty well.Perhaps it's just the large scale that fools me?


Oh and...I did the simple algebra a seagull can handle and that to
make an image withX:Y PROPORTIONS that match the corners I want ....

(lon1-lon2)/((lat1-lat2)/cos(((lat1-lat2)/2)+lat2))=(X/Y) where Y=1 of course.
....or something like this depending on N/S of Equator and E/W of Greenwich,but as long as the output proportion agrees with common sense,...Subtracting "larger from smaller" should do the trick ?and "adding to the smaller" likewise. "-"=south and west not needed and gets too "busy"....they work and this is pretty cool!

[HappySeagull]

"WGSexentrik 0.081819
lontox (lon) return (lon * PI/180)
lattoy_WS84 (lat)
(
e = WGSexentrik;
sinl s = (l * M_PI/180.0);

return log (tan (M_PI / 4 + l * M_PI/360) * pow ((1. - s * e) / (1. * s + e) e / 2.));
)
W = lontox (lon1)-lontox (lon0);
ly = lattoy_WS84 (lat0)-lattoy_WS84 (lat1);

Then in the code, I adapt the height and width of the image to have the same relationship between lx and ly."
...I'll have to rearrange it ...I can't see it so clear with "lattoy",return and such in there!but I think I know what you mean..
all the GEOdatum models, are a tiny bit compromised on a not-exactly spherical Earth and Projection-to-flat Map adds a little more.. so Google Earth tweaks their model even more to display "intuitively" , I guess.
But I'm happy with "close enough" accuracy... the sounder always trumps me+gps+chart!

[Netsurfer]

Originally Posted by MdJ

imgkap Version 1.1

Install

For all system, tested on Windows 32 and on linux 32 and 64 bit

Having a C or C++ compiler : gcc, g++…

Download and install freeimage-dev, on Ubuntu > sudo apt-get install libfreeimage-dev
Prefer last version, see The FreeImage Project

Download imgkap.c and compile width gcc or g++:
> gcc imgkap.c -O3 -s -lfreeimage -o imgkap

I wanted to install the program on my Debian Lenny server.

I tried

gcc imgkap.c -O3 -s -lfreeimage -o imgkap

with the following result

imgkap.c: In function 'writeimgkap':
imgkap.c:1078: warning: incompatible implicit declaration of built-in function 'log2'
imgkap.c:1134: warning: incompatible implicit declaration of built-in function 'round'
imgkap.c: In function 'kaptoimg':
imgkap.c:1348: error: 'FI_COLOR_IS_RGB_COLOR' undeclared (first use in this function)
imgkap.c:1348: error: (Each undeclared identifier is reported only once
imgkap.c:1348: error: for each function it appears in.)
imgkap.c:1348: warning: assignment makes pointer from integer without a cast
imgkap.c: In function 'imgheadertokap':
imgkap.c:1549: error: 'FI_COLOR_IS_RGB_COLOR' undeclared (first use in this function)
imgkap.c:1549: warning: assignment makes pointer from integer without a cast
imgkap.c: In function 'imgtokap':
imgkap.c:1676: warning: incompatible implicit declaration of built-in function 'round'

As I am a total Noob on Linux any help is appreciated.

Or if anybody has another idea ...
I want to use the program for installing an OpenCPN community KAP chart DB. So users should be able to upload their KAP chart files. On the server the chart should be splitted into the header and the image.

Many thanks in advance,

Gunther

[cagney]

Gunther
I think that you may not have all the necessary "development headers" installed.
You may try

apt-get update && apt-get upgrade
apt-get install build-essential

depending on how you keep your server updated. The main thing is to have the meta package "build-essential" installed.
Did you follow this instruction

Download and install freeimage-dev, on Ubuntu > sudo apt-get install libfreeimage-dev

This package may have a different name in Debian.

Thomas

[Netsurfer]

Originally Posted by cagney

Gunther
I think that you may not have all the necessary "development headers" installed.

Hmmm ..., looked like there were 6 packages missing -> installed.

This package may have a different name in Debian.

I think it has the same name and should be installed:

# apt-get install libfreeimage-dev
Paketlisten werden gelesen... Fertig
Abhängigkeitsbaum wird aufgebaut
Lese Status-Informationen ein... Fertig
libfreeimage-dev ist schon die neueste Version.

Tried again afterwards but still with the same error messages:

imgkap.c: In function 'writeimgkap':
imgkap.c:1078: warning: incompatible implicit declaration of built-in function 'log2'
imgkap.c:1134: warning: incompatible implicit declaration of built-in function 'round'
imgkap.c: In function 'kaptoimg':
imgkap.c:1348: error: 'FI_COLOR_IS_RGB_COLOR' undeclared (first use in this function)
imgkap.c:1348: error: (Each undeclared identifier is reported only once
imgkap.c:1348: error: for each function it appears in.)
imgkap.c:1348: warning: assignment makes pointer from integer without a cast
imgkap.c: In function 'imgheadertokap':
imgkap.c:1549: error: 'FI_COLOR_IS_RGB_COLOR' undeclared (first use in this function)
imgkap.c:1549: warning: assignment makes pointer from integer without a cast
imgkap.c: In function 'imgtokap':
imgkap.c:1676: warning: incompatible implicit declaration of built-in function 'round'

BTW: Where (in which path) should I put the source file (imgkap.c) or doesn't it matter?

Anything else I could try?

Thanks
Gunther