I'm using the Project Raster tool via arcpy:

     in_raster = clipped_raster,
     out_raster = projected_clipped_raster,
     out_coor_system = COORDINATE_SYSTEM_WGS_1984_WEB_MERCATOR,
     resampling_type = "CUBIC",
     geographic_transform = TRANSFORM_US_IFR_TO_WGS_1984_WEB_MERCATOR,
     in_coor_system = COORDINATE_SYSTEM_US_IFR)

Before the image has a white background:

enter image description here

But after the projection, its grey:

enter image description here

Any idea why this would be happening?

---- EDIT ----

Per the suggestion by @Fetzer, I check the Stretch setting. I see it has Percent Clip:

enter image description here

However, when I set it to None per his suggestion, the grey actually gets darker:

enter image description here

  • What about turning off Gamma Stretch? or adjusting the settings for min/max to 0.5 or something... – Fezter Apr 27 '16 at 23:03
  • @Fezter, turning off Gamma Stretch lightens the grey a little bit, adjusting min/max, also lightens the grey a tiny bit. Combining the 2 makes no additional difference... I did notice that, on the display tab, Contrast was set to 10% (original image was 0, so no clue why that got set to 10). When I changed it to 0, it got darker... So i changed it to 50, and the grey practically disappears. Any idea why that would be? Also, at the risk of sounding ignorant (which i am), what led you to think transparency/stretch in the first place? – Lucas Apr 28 '16 at 15:34

A couple things might be happening here.

  1. You have a transparency on the layer (unlikely).

  2. You have a stretch type defined in the symbology for the raster.

    This might be standard deviation: enter image description here

Set it to None and see if that makes any difference.

  • Yup, it does have a stretch. And it is set to Percent Clip. Setting it to None actually made the grey darker... (see edit above) – Lucas Apr 27 '16 at 22:52

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