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Quenya

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    Silly Garmin POI Tricks

    in GPS technology and devices

    Posted · Edited by Quenya

    So if magenta isn't working as a transparent color, make sure your palette matches the palette of a file that works, which looks like it should have magenta in the 200th spot (Index = 199).

     

    O.K., magenta in the 256 spot of the palette (Index = 255) doesn't show transparent.

    Anyway I have always less than 256 different colors in a 16 X 16 pixels (= 256 pixels) icon:

    (a 16 X 16 pixels icon with 256 different colors can at most contain only one magenta-pixel, wich is quite useless in the question of transparency).

    Try to rebuild the color palette so that it contains no more colors than used in the image.

    When done so the spot (position) of the magenta backgroundcolor in the palette is not critical.

    I've put some images on the web to clarify:

     

    http://home.scarlet.be/~tse99634/Lamp_A.bmp displays with transparent background on my GPSmap 60Cx

     

    http://home.scarlet.be/~tse99634/Lamp_Pixels.jpg shows the 16 X 16 grid of the image

     

    http://home.scarlet.be/~tse99634/Lamp_Color_Palette.jpg shows the color palette of the image

     

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    First let me say YOU ARE THE MAN! But i have a question. I purchased 4 poi files. I would like to load them in 2 groups. 3 in one group and 1 in the other. I tried loading 3 the changing the name then loading 1, but when i open the gps it still shows 4 files. Any ideas on how to fix?

     

    Thanks Lee

     

    I've put also an image on wy web that shows a (theoretical) directory structure for loading different poi files in different subcategories. The poi files could be .gpx or .csv files.

     

    http://home.scarlet.be/~tse99634/Poi_Directory.jpg

     

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    Silly Garmin POI Tricks

    in GPS technology and devices

    Posted

    I tried everything, 24x24, 16x16, 8 bits, 200x200, etc. It simply doesn't work, which drives me crazy!

    I cannot understand what am I doing wrong here!

     

    WHich program do you guys use to edit your bmp files?

    I tried Paint and IrfanView - is there anything else I can try to make this happen?

     

    I use CorelPaint to make the conversion of 24-bits RGB pictures to 8-bits RGB pictures.

    After the conversion I apply RGB(255,0,255) as the background color.

    Using IrfanView to decrease the color depth is not recomendable in that IrfanView may change the color RGB(255,0,255) in a resembling e.g. RGB(254,1,254) wich isn't transparant on the GPSmap 60Cx.

     

    Using an older version of Poiloader could also cancel the transparent background feature. Use version 2.4.1 or newer:

     

    "Changes made from version 2.3.5 to 2.4.1:

    ...

    * Added the ability to send bitmap images that contain magenta as a transparent color.

    * Added support for subcategories of POI's.

    * Added support for handling individual bitmap symbols for each subcategory of POI's.

    * Added support for jpeg (.jpg) images that can be associated with POI's.

    ...

     

    grtz

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