No thats image preprocessing to lose information before compression. JPG would be smaller if color count was reduced as well.
If color quantization using a specific algorithm was part of PNG you could say its lossy compression, its not, PNG is not lossy compression by any definition. Your specific image processing pipeline might be lossy, based on various tools you ran the image through or equipment used to capture, PNG is not.
If color quantization using a specific algorithm was part of PNG you could say its lossy compression, its not, PNG is not lossy compression by any definition. Your specific image processing pipeline might be lossy, based on various tools you ran the image through or equipment used to capture, PNG is not.