Color Shift On Preview, Raw Size Change To Half

https://www.cybercom.net/~dcoffin/dcraw/ wrote:Why does dcraw output have a green tint and weak color?

Because dcraw doesn't have a color matrix for your camera model, it outputs raw color instead of sRGB. To fix this, I need a photo of a Wolf Faust, ColorChecker, CMP, or other calibrated color chart. Follow this checklist:

Use a real chart, not a printout or screen image.
Wait for sunny weather, local noon ± two hours.
Carefully brush any dust off the chart.
Tilt the chart 90° to the camera and 45° to the sun to avoid specular reflections.
Set the camera two meters away and use telephoto zoom.
Use the lowest ISO setting.