PropertyCase

Property cases are basically variables in the camera's RAM that we can read and write from CHDK by using uBasic commands get_prop and set_prop. "Under the hood" some other uBasic commands work by changing propcases, making it possible to use them in a portable way. Some propcases are read only. Often writing to a propcase will have a different effect than pressing the corresponding buttons on the camera's user interface. Typically this means that while you may change something like the shutter speed and your change will be effective in your photo, it may not be updated to the camera's on-screen display.

NOTE: These properties are different for Digic II and Digic III cameras (for example, the A570IS ISO is at #149, not #21 like on the S3IS, and the white balance control is #268, not #206). Furthermore, some Digic III cameras (G7 and IXUS850IS/SD800IS) use the Digic II property set. You are advised to confirm that these properties are appropriate for your camera before you attempt to change them.

To find out which prop id´s a funktion changes see this!

Digic II

#	Digic II (and some of the Digic III cameras)
0,236	Shooting mode dial position
1	Photo effect
2	Custom MyColors Sharpness
3	Custom MyColors Saturation
4	Custom MyColors Contrast
5	White Balance Mode (0,1,2,3,4,5,7 = Auto, Day Light, Cloudy, Tungsten, Fluorescent, Fluorescent H, Custom)
6	Drive mode (0-normal, 1-continuous, 2-timer)
8	Hi-speed continuous (1=OFF, 0=ON)
9	Metering mode (0=eval 2=center, 1= spot)
10	Spot AE Point (0=center, 1=auto focus point)
11	Macro mode (0,1, or 5 for normal, macro, super macro)
12	Manual Focus (0=auto, 1= manual)
13	AF (S3IS: 0=Single,1=continuous)
14	Delay of selftimer (in msec)
15	Flash adjust mode (S3: 0=Auto, 1=Manual (see 28&29)
16	Flash mode
18	Red eye mode (0=OFF, 1=ON)
19	Flash slow sync (0=OFF, 1=ON)
20	Flash Sync Curtain (0=1st, 1=2nd)
21	ISO value (for S3: 0=auto, 1=ISO-HI, or actual ISO: 80,100,etc)
23	Image quality (for S3: 0,1,2 from best to worst)
24	Image resolution (for s3: 0,1,2,4,8 for L,M1,M2,S,W)
25,26	EV correction (units: +/- 96 per 1 stop range)
28	Flash correction (units: +/- 96 per 1 stop range, if #15=0)
29	Manual flash output (units 0,1,2 from less to full, if #15=1)
32	Exposure bracket range (units: 96 per 1 stop extension)
34	Focus bracket range (2=Smallest, 1=Medium, 0=largest)
36	Bracket mode (0=none, 1=EV, 2=focus)
37	Orientation sensor
38	Automatic Rotation (1 = on, 0 = off) (confirmed for s3is)
39	Chosen Av (by user)
40	Chosen Tv (by user)
58	Digital Zoom (1=On,0=Off) (Confirmed for s3is)
63	AF-light (1=On, 2=Off) (confirmed for s3is)
64	manual settings
65,66	Focus distance
67	focus ok (green, not yellow) when in photo mode 1=OK, 0=not set
68	Coming Av
69	Coming Tv
70
71	422
72	Looks like it's ~ISO*something + 380
73	371
74	AE lock activated (S3: 1=yes, 0=no; see 205)
75	0
76	0
77	min available Av
78	Flash fired (Read only ?)[1]
79	Flash fired (R/W) [2]
80	1
81	1
82-85	Often the same, sometimes slightly different
86	Av
87	0
88	2
89	0
90	0
91	5
92	0
93	0
94	0
95	8
96	10
100	varying
101	constantly varying with light
126	Video FPS
127,13	Video resolution
128	Video resolution = 640x480
171	Zoom
172	Digital zoom
177	intervalometer #of shots
178	File Numbering reset
181	Display mode (record mode only) (0 = show info icons, 1 = Do not show info icons, 2 = LCD off, 3 = EVF)
192	AF Frame/Flexizone x-position
194	used part of sensor when digital zoomed
195	max resolution?
196	Language Setting - 2=english,2050=swedish,4098=hungarian,258 = german, 2306 = spanish, 4354 = turkish,514 = french, 2562 & 4610 = chinese? (weird symbols),770 = dutch, 2818 = russian?, 4866 = ???, 1026 = danish, 3074 = portuguese, 5122 = ???, 1282 = suomi, 3330 = greek, 5378 = ???, 1538 = italian, 3586 = polish, 5634 = ???, 1794 = norsk, 3842 = czech) (Confirmed on s3is. languages marked with ? are unknown, because camera shows symbols i cannot decipher :)) - NOTE: I just discovered that this setting directly is related to NTSC/PAl setting. these numbers are valid vor PAL. If you set to NTSC, all these numbers are decremented by 1, meaning english is 1 and german is 257 in NTSC (instead of 2 and 258).
200	Selected Movie mode
205	1 during shooting process (this may be an indication that exposure has been determined; it is set shortly after shoot_half, and remains set if AE lock activated. See #74)
206	Submode of "MyColors?" mode, including Color accent/swap (S3is - 0-11: off,strong,neutral,sepia,black/white,dia,brighter skintone,darker skintone,strong blue,strong green,strong red,custom color)
207	Custom MyColors Red
208	Custom MyColors Blue
209	Custom MyColors Green
210	Custom MyColors Skin Tone
211	Color Accent color
212	Color Swap from color
213	Color Swap to color
218	Custom timer continuous (value: # of shots to be taken)
219	Self Timer setting (s3: 0=2 sec, 1=10 sec, 2=custom continuous)
227	Mic Level (s3: 1-5, low to high)
228	Mic Wind Protection (s3: 1: on, 0= off)
229	IS (0,1,2,3 = continous, shoot only, panning, off)
230	Converter (0=off, 1 = wide, 2 = tele)
231	Color Accent tolerance setting
233	Color Swap/Accent tolerance
236	Mode dial
237	47
254	Focus. auto, 320-725
257	Color Swap tolerance setting
260	500
262	0 in fireworks or movie mode, otherwise 1
274	411
298	201329664
299	-201264128

Digic III

#	R/W ?	Most Digic III (such as SD1000, A570IS and A590IS)
3	RO	Auto-Exposure Lock
5		AF Assist Beam Setting (0,1 = Off, On)
6		Focus Mode (0,1,3 = Normal, Macro, Infinity)
8		AiAF Mode (0,1,2 = On, Off, FaceDetect)
11	RW	Auto-Focus Lock
18	RW	Auto-Focus state after half-press (stays 1 if shoot_half is released!) (0 orange, >=1 green)
		(with AiAF=off only 0 or 1, with enabled AiAF or Face the value depends on position & number of AF boxes)
21		Auto Rotate (0,1 = Off, On)
23	RW	Av (for next shot, updates on half-shoot), 96 per 1 stop
24		Min Av (widest available aperture for current zoom, updates on half shoot), 96 per 1 stop
25		Min Av (widest available aperture for current zoom, updates on half shoot), 96 per 1 stop
26	RW	User Av (user selected "market" value in M/Av modes, writes become effective on LCD on half shoot), 96 per 1 stop.
34		Bv
49,50		MODE
57		Picture Quality (0,1,2 = Superfine, Fine, Normal)
60		Converter (0,1,2,4)
63		Number of continuous shots taken last time
64	RW	Flash Sync Curtain (0=1st, 1=2nd)
65		Subject Dist 2 ("Near limit", most linear to real distance. You can get-and-set this prop_id, but it doesnt affect the near limit and/or the focus - tested with A590)
79		Delta Sv (What is this? Someone please add a description.)
91	RO	Digital Tele-Converter mode (>0 if enabled)
92		Digital zoom source image width in pixels
94		Digital zoom mode (1="Standard", 0=any other mode)
95	RO	Digital zoom depth (0--6: 0=none, 1--6 are for camera dependent zoom steps, higher number = higher magnification)
102	RO	Drive Mode (0,1,3 = single, continuous, timers)
103		changes with light only in M-Mode (-445 is completely dark and 328 is fully bright. Also depends on the current av/tv setting.)
105		Display mode (record mode only) (0,1,2,3 = show info icons, do not show info icons, LCD off, EVF)
107,207	RO,RW	Exposure Shift/Compensation (32 for 1/3 stop)
115		Ready to shoot
121	RW	Flash adjust mode (0=Auto, 1=Manual (see 127&141)
122	RO	Flash used in last shot (0,1 = Flash not used, Flash used)
127	RW	Flash exposure compensation (units: +/- 96 per 1 stop range, if #121=0)
133		Manual Focus Mode (0,1 = Off,On)
141	RW	Manual flash output (units 0,1,2 from min to full, if #121=1)
143	RW	Flash Mode (0,1,2 = flash auto, flash on, flash off)
145		IS (0,1,2,3 = continous, shoot only, panning, off)
149	RW	ISO Mode (0=auto, 1=high auto, 100=manual ISO 100 etc)
155		Metering Method (0, 1, 2 = Evaluative, Spot, Center)
165	RW	Time lapse movie shoot interval (milli-seconds)
166		Movie frame rate
184		My Colors (0 - 11): 0=Off, 1=Vivid, 2=Neutral, 3=B/W, 4=Sepia, 5=Positive Film, 6=Lighter Skin Tone,
		7=Darker Skin Tone, 8=Vivid Red, 9=Vivid Green, 10=Vivid Blue, 11=Custom Color)
195		Zoom position (0,1,2,3,4,5,6...)
196		(? Scene dependent/ stays 0 when scene is black or when scene has optimal light)
206		Shooting in progress
208		Flash Ready (1 during shutter half press after metering if camera is going to use flash)
213		Red-Eye (0 "Off", 1 "On")
218	RW	Picture Size (0,1,2,3,4,6,8 = L,M1,M2,M3,S,Postcard,W)
219	RO	Orientation Sensor (0,90,270)
220		Safety FE (0 "Off", 1 "On")
223		Timer Mode (0,1,2 = 2 Second, 10 Second, Custom)
224		Timer Delay (ms) (can't override)
227		"long time exposure" indicator: 1 always in "Night snapshot" scene mode & when the exposure time is set to >= 1s
245		Subject Dist 1 (equals id 65 on the A590)
246		Sv Market (for next shot, updates on half-shoot), 96 per 1 stop
247		Sv (for next shot, updates on half-shoot), 96 per 1 stop
262	RW	Tv (for next shot, updates on half-shoot), 96 per 1 stop
264	RW	User Tv (user selected value in M/Tv modes, writes become effective on LCD on half shoot), 96 per 1 stop
268		White Balance Mode (0,1,2,3,4,5,7 = Auto, Day Light, Cloudy, Tungsten, Fluorescent, Fluorescent H, Custom)
269		White Balance Value (Middle around 900. Less corrects red and higher corrects blue. Can't override.)
277		Safety MF (0 "Off", 1 "On")

On the A590, it seems that possible prop-id´s range from 0 to 287. Id´s greater than 287 will return always "14".

Not found

• Manual White balance settings, needed for white balance fine tuning
• MF Point Zoom
• AF-assist Beam
• Number of shots in Custom drive mode
• Review time
• Selected Scene Mode
• Current Display Mode, i.e. no info, more info, full info, where you cycle through by pressing disp.

Where could these be stored? I scanned all Property Cases from 0 till 300, after that everything seems to be 0. PTT 01:59, 9 July 2007 (UTC)

• A face is being detected

   Some parameters can be read with the function get_parameter_data().
   Вut the numbers of parameters depends on the camera model. For example, Canon 710 IS:
72  Delay in Custom drive mode (in seconds, 1 byte)
73  Number of shots in Custom drive mode (1 byte)
 9  Review time (in msec, 4 bytes)
54  Current Display Mode for record review mode - 0,1 or 2 (2 bytes)
53  Current Display Mode for view mode - 0,1 or 2 (2 bytes)

get_parameter_data()

Here are a few values that I think work that way with get_parameter_data() on my ixus 950 is... maybe someone can test and verify them for this cam or even for others?

18   LCD Brightness
56   Current Display Mode for view mode - 0,1 or 2
73   Number of shots in Custom drive mode
104  "Show clock" (in seconds)

Timezone Information

On my cam (ixus 950 is) get_parametr_data(20,...) seems to be the timezone information. There is a strong correlation of the following values (Names are in german or translated):

(DST Must be somewhere else)
65792 London
65793 Paris
65794 Kairo
65795 Moskau
65796 Teheran
65797 Dubai
65798 Kabul
65799 Karachi
65800 Delhi
65801 Kathmandu
65802 Dacca
65803 Yangon
65804 Bangkok
65805 HongKong
65806 Tokyo
65807 Adelaide
65808 Sydney
65809 Solomon Islands
65810 Wellington
65811 Chathman Islands
65812 Samoa
65813 Honolulu
65814 Anchorage
65815 LosAngeles
65816 Denver
65817 Chicago
65818 NewYork
65819 Caracas
65820 NewFoundland
65821 Rio De Janeiro
65822 Fernando de noronha
65823 Azoren

Given that there are more than 24 of such entries, these seem to be offsets into somewhere else, will need to find it there... My cam also has a travel timezone setting. I get really high numbers for when chosing one, so it looks to me like they get somewhat ORed together with a shift or so... need to still test...