Timelapse images and GIFs are all black

[James-S-Santangelo]

Environment Information

Please run the following code on your computer and share the output with us so that we can better debug your issue:

import geemap
geemap.Report()

Description

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Tell us what happened, what went wrong, and what you expected to happen.

I'm trying to create a timelapse GIF for a particular region, but all the images are showing up black on the map (see below). I am able to add a timelapse to the map, but cannot generate the images to create a GIF.

What I Did

Paste the command(s) you ran and the output.
If there was a crash, please include the traceback here.

Here is the code I ran to generate the above figure:

roi = Map.draw_last_feature

collection = geemap.landsat_timeseries(
    roi=roi, start_year=1984, end_year=2019, start_date="01-01", end_date="12-31"
)

first_image = collection.first()
vis = {"bands": ["Blue", "Red", "Green"], "min": 0, "max": 4000, "gamma": [1,1,1]}
Map.addLayer(first_image, vis, "First image")

Note that the following code works and generates a timelapse:

label = "Urban Growth in Ottawa, Canada"
Map.add_landsat_ts_gif(
    label=label,
    start_year=1984,
    bands=["Red", "Green", "Blue"],
    font_color="white",
    frames_per_second=2,
    progress_bar_color="blue",
)

Any idea what might be happening? Thanks!

[giswqs]

It is reflectance data, the value range should be 0-1. Change max from 4000 to 1 or smaller

[James-S-Santangelo]

That seems to have done something, but the image is still quite dark. Any idea how I can make it as light as the one in the Youtube tutorial or those ready for download from Google? Thanks!

[giswqs]

Set an even smaller max value, e.g., 0.4. It should become brighter