Originally Posted by daveycrocket222:
“I was missing no picture last week. The picture was fine. They should have fixed it. Challenge TV have never had this problem before and if they have a simple email and they ll fix the situation.”
Okay.. I'll try to explain this more clearly - using a diagram!
http://i.imgur.com/Hzy9ChP.png
The top-left image is how Classic Who was filmed. It's the aspect ratio of TV at the time - 4:3.
When 4:3 programmes are broadcast, your TV can display it in a number of ways.
The top-right image shows all of the original image - adding pillarboxes (black bars) to keep the aspect ratio the same.
The bottom-left image shows the TV stretching the imageto fill the screen. This distorts the picture you see.
The bottom-right image shows the image zoomed and cropped (often called 'pan and scan'). You lose the image at the top and bottom of the screen.
Preserving OAR is the correct way of watching programmes like this if you want to preserve both image and aspect ratio. From what you describe, your TV isn;t set up like this - that's okay. It's your choice.
The reason Spearhead is acting differently for you is because it's been remastered in HD. HD has no 4:3 standard. Instead, remastered 4:3 programmes are pillarboxed to 16:9. So the broadcast was in 16:9 to start with, and so your TV didn't change. There is no way to change this - this is the standard for HD broadcasting, and SD channels are downscales of HD.