/ic/ - Artwork/Critique

>>4035387
According to wikipedia, VHS has a luma resolution of 336x480 and a chroma resolution of 40x480.

So first I added the background, and cropped to 4:3 aspect ratio.

Then I decomposed the image into 3 channels using the rec704 colorspace: luma, red chroma and blue chroma.

Then I resized luma to 336x480, and each chroma channel to 40x480.

Then I recompose the channels again using the rec 704 colorspace. To get this to work, I had to make all the channels the same size, so I had to rescale the 40x480 channels to be 336x480. This is OK, because the effect is the same, even when upscaled the chroma will be lower resolution than the luma.

After that I rescaled the image from 336x480 to 640x480.

Then I did a gaussian blur of 0.7 pixel radius.

Then desaturation @ 75%

Then boosted the green channel.

Finally, I used levels and changed the output to be 16 - 235 instead of 0 - 255, since TV signals are clamped at those values, and don't use the full range like PC monitors do.

Attached is one where I didn't do any desaturation at all.

Key aspects (IMO):
- horizontal ppi is less than vertical ppi (the 336x480 scaled to 640x480)
- chroma resolution is less than luma resolution (40x480 vs 336x480)
- chroma resolution is very low, vhs had bad color
- output is in limited yuv range 16-235 instead of 0-255

Also I think part of your problem was the noise. Noise means details, and a sharp image. But NTSC VHS didn't really have a sharp image, it has a very soft, blurry image. Noise makes it look more like a higher definition, a high resolution film scan or something, not a VHS or 90s TV screencap.