Jump to content


Photo

Joys of a crappy lens, DV, 8-bit & JPEG


  • Please log in to reply
No replies to this topic

#1 Peter J DeCrescenzo

Peter J DeCrescenzo
  • Sustaining Members
  • 620 posts
  • Camera Operator
  • Portland, OR, USA www.peterdv.com Blog: http://herefortheweather.wordpress.com/

Posted 30 August 2005 - 02:30 PM

The attached frame grab is nothing else but a perfect example of what not to do -- but at least the view is nice.

This frame is from my new DSR-450WS 2/3" DVCAM camcorder, pointing out my window towards San Francisco to the west. We've finally had some relatively clear weather for the past few days after a few weeks of fog, although there's still a light haze. (I'm looking forward to October when we often have some crystal-clear weather.)

This is a great illustration of the many ways a good cam's imagery can be degraded, including by using an entry-level lens (Canon YJ19x19B4-KRS), DV's 5-to-1 compression, 8-bit color depth, and JPEG compression.

There's a polarizer & UV filter in front of the lens, the iris was at f2.8 with the internal ND filter set at position #4 (1/64ND). The cam's white balance/electronic color correction was set at the 5600K preset, and the cam is in its native 16:9 aspect ratio mode.

The camera's detail level & other settings were adjusted using the suggested values listed at the end of Simon Wyndham's article on his website:
http://www.simonwynd...camerasetup.htm

The frame was grabbed via Firewire onto my PDX10's memory stick card (640 x 480 mode), then resized to 640 x 360 in my Mac and resaved as JPEG at 98% quality.

So, kids, can you count how many times the image was degraded? :)

I'm looking forward to doing a similar test at some point using a better (rented) lens and a frame grab using my cam's SDI 10-bit 4:2:2 "live" output.

All the best,

- Peter DeCrescenzo
DSR_450WS_SF_wa_0080.jpg
  • 0


Tai Audio

Glidecam

Ritter Battery

Rig Wheels Passport

Opal

Aerial Filmworks

CineTape

Metropolis Post

Media Blackout - Custom Cables and AKS

Technodolly

Abel Cine

FJS International, LLC

The Slider

Wooden Camera

Paralinx LLC

CineLab

Visual Products

Broadcast Solutions Inc

rebotnix Technologies

Willys Widgets

Gamma Ray Digital Inc

The Slider

CineTape

Paralinx LLC

Aerial Filmworks

FJS International, LLC

Gamma Ray Digital Inc

Glidecam

Visual Products

Abel Cine

Broadcast Solutions Inc

Rig Wheels Passport

Opal

Willys Widgets

Tai Audio

Ritter Battery

Media Blackout - Custom Cables and AKS

CineLab

Wooden Camera

Technodolly

rebotnix Technologies

Metropolis Post