Why my added tif image(RGB) color only has one single color (green)?

MapWinGIS
1

when i add tif image, the color is not same as in the arcmap. why? The code by mapwingis 5.3 is below.

image
image572×530 32.5 KB

The color of added image by up code is below.

QQ拼音截图20231006221133
QQ拼音截图202310062211331364×954 79.8 KB

And the return value(rrcolorScheme) of .RenderingMode is only read. How to change it to rrRGB
image

2

I got the answer :
newImage.AllowGridRendering = tkGridRendering.grNever;
newImage.UseRgbBandMapping = true;