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Colorimetric and Resolution requirements of cameras

Alan Roberts

ADDENDUM 25 : Canon XH G1 (and XH A1)

Data for this addendum is taken from a short examination of one production model of the Canon XH G1

HDV camcorder. It has 3 16:9 1”/3 ccd sensors of 1440x1080 pixel dimensions (4.5mm diagonal). It

records interlaced HDTV using the HDV algorithm onto standard mini DV tapes (1080i) and progressive

HDTV using a Canon proprietary format onto the same tape and at the same data rate, and SDTV using

normal DV format. The A1 (not tested here) is a slightly simplified version of the G1.

The camera is relatively light (about 2.1kg excluding battery) and has an integral lens and viewfinder, with

side lcd panel, and seems aimed at the middle to high-end consumer/low-end professional market rather than

full broadcast, which would normally demand interchangeable lenses and better control.

It has internal menus for setting the performance, not as complex as in a full broadcast camera, but enough to

control some of the important features, albeit only in “on/off” states. It is possibly suited to multi-camera

operation because it has an HDSDI connector for video output (not in the A1). This potentially makes it

useful in the broadcast and other high-end markets. It has analogue video outputs (3.5mm jacks and BNC on

the G1) and digits via IEEE1394 Firewire.

The same assessment procedure was used as for other HD cameras, partly attempting to get a good “film-

look”, and the settings reflect that. However, because of the lack of internal test signals, and as a result of

some of the initial measurements, that approach was quickly abandoned and efforts were directed at getting a

decent colorimetric performance from the camera. Assuming that a grading operation will be used in post-

production, the settings attempt to give the colourist a reasonable exposure range, but this is inevitably well-

short of what a film stock could be expected to deliver.

1 2 3 4 5 6 ... 15 16

Sommario

Pagina 1

1 Colorimetric and Resolution requirements of cameras Alan Roberts ADDENDUM 25 : Canon XH G1 (and XH A1) Data for this addendum is taken from a sho

Pagina 2

10 CARD CAMERA MENU Signal Setup item sub Range comments BBC Genlck Adjust -1023~1023 Comp.Out 576i,1080i/576i 480i,1080i/480i for NTSC

Pagina 3 - 1 Controls, Connections

11 CVF+LCD On On,Off Language German,English,Spanish, French,Italian,Polish,Russian, Chinese,Japanese Markers Off,LevelMark,Cent.Mark,Grid

Pagina 4 - CAMERA MENU

12 Save To Card Read From Card Reset Tune Shckls WB.GN 00~03 AE Response 00~02 High-Speed Zoom 00 (Off)~01 (On)

Pagina 5

13 CARD VCR/PLAY MENU Signal Setup item sub Range comments BBC Comp. Out 576i,1080i/576i 480i,1080i/480i for NTSWC model SDI Out On,Off

Pagina 6

14 Read From Card Reset Tune Shckls WB.GN 00~03 AE Response 00~02 High-Speed Zoom 00 (Off)~01 (On) Focus Ring Ctrl 00

Pagina 7

15 3 Measurements 3.1 Colour performance. Assessment was done using Macbeth charts. There was a distinct red tinge to the picture, although not in

Pagina 8 - VCR/PLAY MENU

16 aliasing above this frequency which is not present in the 50Hz interlaced mode. I can think of no reason why this should be. Horizontally, noth

Pagina 9

2 Colorimetric and Resolution requirements of cameras Alan Roberts Addendum 25 : Canon XH G1 (and XH A1) Data for this is taken from a short examin

Pagina 10 - CARD CAMERA MENU

3 1 Controls, Connections name place feature comment Power switch Left, on large control dial Also mode controls for many other features Focus

Pagina 11 - Customize

4 2 Menus CAMERA MENU Signal Setup Basic camera system settings Item sub range comments BBC Time Code Frame setting Drop,NonDrop Only in NTSC

Pagina 12

5 Display Setp item sub range comments BBC CVF Setup Brightness Viewfinder control Contrast Color Sharpness Backlight Br

Pagina 13

6 Dtl HV Balance -9~+9 -9=H only, +9=V only 0 Coring -9~+9 0 NR1 Off,Low,Middle,High Noise reduction, can cause smears NR2 Off,Low,Middle,

Pagina 14

7 Tune Rec Programs 00 (Off)~01 (On) Record mode icon Camera Data 1 00~03~07 Aperture, Shutter Camera Data 2 00~07 Exposure, WB, Gain

Pagina 15 - Figure 4 HDSDI, 25p

8 VCR/PLAY MENU Signal Setup item sub Range comments BBC Time Code Frame Setting Drop,Non-Drop NTSC version only Count Up Rec-Run,Rec-Run

Pagina 16 - 3.3 Noise

9 Custom Key 2 TimeCode,TVScreen,DataCode,AudioLevel,TCHold, CVF+LCDBW,(None) D/Time Set T.Zone/DST Date/Time Date Format YMD,MDY,D

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