How to avoid artefacts in color calibrated image?

[camilo1704]

Question

I have used the example for color calibration using a color checker and the output image seems to have some artifacts. Any idea how to avoid them? Here are the original an the color calibrated images:


Thanks in advance!

[KelSolaar]

Hello @camilo1704,

The image is visibly a highly compressed jpg so it is not entirely surprising. Running a Laplacian filter on it really does show blocking artefacts:

Without trying to do a complex colour correction, a simple white-balance on the Neutral 5D swatches highlights that this is not going to work:

I would recommend sourcing a higher quality uncompressed image.

Cheers,

Thomas