I got some images from our Kindergarten which are photographs of childrens’ drawings. These are intended to be printed on white background. Unfortunately, 4 of the 39 images are painted on yellow paper. I tried to remove the yellow paper with several methods, but unfortunately I am not satisfied with the results.
Here’s an example (crop) of an image (unfortunately I cannot make a PlayRaw out of them as I do not own them):
IMG_2783_pixls_crop.tif (3.5 MB)
The original photograph is available as raw, most of these unfortunately photographed at ISO 6400.
What I tried so far is to use a yellow layer in gimp and blend modes to get rid of the paper color. I tried to better match the yellow by utilizing the original image, but whatever I try, I end up either with extreme noise (when I use a more uniform yellow, e.g. by median filtering with large radius) or strokes that seem to be composited from too many colors or both. Especially the lighter tones (e.g. orange on yellow) are difficult.
What I would try next, is to use some inpainting to get a better yellow base layer, but as I do not own a graphics tablet to paint the mask, I am still hoping for a better, automatic, approach.
Any help appreciated .