I'm recently experience this problem with all my pictures. Previously, noises are very small and easy to erase off in Lightroom.
But recently, I've noticed that my photos produce GIF-like noises. I would say it only happens on gradients in the picture. for example, from black to gray gradient, there would be noises in the middle instead.
this happens right after I changed the color space to adobeRGB in my Sony a230, but I've tried using sRGB but the problem is still there.
anyone knows the problem?
The gradient grains appear different in Photoshop, Lightroom and when saved as JPEG. here are the comparison:
I hope someone could really help the noob here!