momweber

Thanks for the info. I didn't realize the lighting would effect so much. I will definately take that into consideration as I do "my" project. (If you have kids you will understand it is never the student's science project but the parents!!). I appreciate your reply.

Hello, my dtr wants to do a science fair project determining which detergent gets out stains better. She needs a way to measure the differences on the white fabric. (something a bit more scientific than just eyeballing) Someone suggested measuring the RGB values. When I posted this question on Windows 7 Paint forum, someone suggested that paint.net would be much better for this. I've downloaded it and have searched help and FAQs etc. on how to do this. Can someone assist please. My dtr would be uploading photos of the different fabrics after washing and comparing these swatches to the control fabric which has no stain. So she would need to compare the RGB values for each stain on the photo (if I am undestanding RGB values correctly) to determine which was "whiter". It would be great if this was something a 5th grader could do. If it is too difficult please let us know so as we can quickly pick another topic. Thanks for any input, it will be greatly appreciated.