Re: [sumo-user] background decals

[Jakob Erdmann <namdre.sumo@xxxxxxxxx>]

for 1) there is a qualification: when loading an image with a world file, the projection of the .net.xml file (from the projParameter of the <location> element) is applied to the parameters of the world file. If you have been using a world file with UTM offset and the network had no associated projection then it would have worked.

When I'm loading your tile as a decal this is the warning I see:

Warning: Invalid longitude 4733.23
Warning: Could not convert coordinates in /localdata/1/debug/petr_decal/decals/Tile_008_009.jpg.

This warning reflects the attempt to transform the input coordinates from WGS84 to UTM (your network projParameter is "+proj=utm +zone=33 +ellps=WGS84 +datum=WGS84 +      units=m +no_defs").

The code that does this has been part of SUMO for the last 12 years (https://github.com/eclipse-sumo/sumo/commit/bc0fe10721642c5cc0b9c15c9d13f254b3049af0#diff-9e8b2ed9872ffc217116527bd64b92a73b1e7b655f895b821ddff5bd3e3de6ea)

Maybe I'm misunderstanding the nature of your problem.

Do you see a similar warning?

What SUMO version are you using?

Does your SUMO show "GDAL" in the feature list (F12 in sumo-gui)?

There might also be a difference between our platforms due to different GDAL library versions.

For 2) can you check whether the gamma problem appears on different computers?

regards,

Jakob

Am Mo., 14. Juli 2025 um 11:48 Uhr schrieb Petr Chytil <PetrChytil@xxxxxxxxx>:

Ad 1) Its funny, because I have been using SUMO longer then 10 years and I've always used UTM decals in metric system without problems (only the origin).

ad 2) Yes, when I change global gamma settings to 0.45, the images looks good, but its not solution for me.

Thanks for support,

Petr

---------- Původní e-mail ----------
Od: Jakob Erdmann <namdre.sumo@xxxxxxxxx>
Komu: Petr Chytil <PetrChytil@xxxxxxxxx>
Kopie: Sumo project User discussions <sumo-user@xxxxxxxxxxx>
Datum: 14. 7. 2025 10:40:55
Předmět: Re: [sumo-user] background decals

1. SUMO only supports jgw files in WGS84 (so the offset must be something in lon,lat and the pixels size must be in degrees). Your world file contains projected UTM data instead.

2. I cannot replicate the gamma-bias. The loaded image in sumo-gui has the same color as in an image view for me. This might be a graphics driver issue.

regards,

Jakob

Am Mo., 14. Juli 2025 um 07:19 Uhr schrieb Petr Chytil <PetrChytil@xxxxxxxxx>:

Hi Jacob,

I attached simple example. The folder contains:

network.net.xml - simple sumo network

Tile_008_009.jpg/jgw - background image in original color

Tile_009_009.jpg/jgw - background image in darker color (linear color space to sRGB)

Tile_009_009_original_offset.jpg/jgw - background image translated to network origin

jgw_offset.jpg - jgw files compare

img_compare.jpg - compare bacground images in photohop and netedit/sumo_gui

Thanks,

Petr

---------- Původní e-mail ----------
Od: Jakob Erdmann via sumo-user <sumo-user@xxxxxxxxxxx>
Komu: Sumo project User discussions <sumo-user@xxxxxxxxxxx>
Kopie: Jakob Erdmann <namdre.sumo@xxxxxxxxx>
Datum: 9. 7. 2025 9:06:03
Předmět: Re: [sumo-user] background decals

can you provide minimal example inputs?

Am Mi., 9. Juli 2025 um 08:36 Uhr schrieb Petr Chytil via sumo-user <sumo-user@xxxxxxxxxxx>:

Hi, 

I'm using georeferenced jpg files as decals and I have two problems.

1 - The position from the .jgw file is taken as absolute. It would be enough to subtract the offset that is written in the opened .net.xml

2 - Gamma correction is applied to the images, I need to have a darkened image as input so that it is displayed in the editor in the correct colors

Regards, Petr

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