GOFREE C-MAP (INSIGHT) Genesis & INSIGHT MAP CREATOR Support > IMC Tips, Tutorials & Showcase

Maximizing sat image detail

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ogre_en:
FIRST POST! Hi gang.

So thanks to a lot of reading and research on here and youtube, I can now sucessfully create amazing sat image maps for my lowrance elite ti2.
I use the google earth screenshot -> photoshop - >save as PNG file - > google earth KML file -> IMC application -> at5 files and it works perfectly.

Now i want to know how to get more detail and i think its somewhere in the photoshop process. I have an off the shelf navionics platinum + map and for the same location the zoomed in detail is better than my own, even though i am experimenting with very high res hi zoom images and the resulting at5s on my unit look more or less the same at all zoom levels regardless of the quality of the png i load into google earth pro to overlay their map.

Is there a way to save the png differently, or do anything differently, in order to get a better result on the lowrance screen? i assume so since the platinum plus looks so much better at hi / max zoom.

can sort of see it here but in person its a big difference - heres an example:

gregory:
To me, it looks like the source imagery used here is different.

I'm not real strong on color balancing but there are some people on this forum that are.

Friendly reminder on this thread - Restrict replies on imagery sourcing to legal sourcing methods.

ogre_en:
yes the source images are much different. i use sat images that show low tide conditions, otherwise id just use the navionics card. i want to make my own but match this level of resolution on the lowrance unit.

gregory:
Depending on the mapping, it's not uncommon to switch sources based on zoom.  It's fairly rare in the professional world to use one imagery source at zoomed in levels and zoomed out levels.  There's usually levels of transition.  There's a number of reasons for this but the main two are it becomes more difficult to downsample than upsample and images tend to lose vibrancy as they are zoomed out.

You say this is something you think you need to do with Photoshop.  Are you seeing degradation in the image at various levels (before vs after photoshop, before vs after IMC)?  In my limited experience, I know Photoshop sometimes downsamples large images in order to be able to work with them.  My thinking is you might try an uncompressed lossless format like TIFF.  Compression makes it more difficult to work in sections and lossiness makes you lose some information with every save.

ogre_en:
was a good idea but using a tiff vs using a png had same result on the unit screen.

in photoshop im using a 300 dpi resolution, but again, end result after "save as" png and tif is same as when i start at 72 resolution in the photoshop file.

cant seem to crack this, too bad would be so nice even if its a lot of work only need to do it one time.

any other ideas?

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