Author Topic: Need help with 997, grainy images  (Read 10116 times)

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Offline cbgeorge

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Need help with 997, grainy images
« on: September 16, 2009, 09:37:30 PM »
I am trying to get best out my unit, but my images are not as clear as seen on other sites people have took, posted. I am using sensitivity to auto, if i set it manual , and 8-12, or higher, it is very sandy looking. I set the contrast on a lower number 2 , 3 or 4 and  the sharp to off, seems if I raise the contrast or sharp, it really becomes grainy. I also use the 455 freq, seems the 800  is very dark on the outer 1/2 of the shots, like set for 100 ft, the last 50 is just dark blue. I try to keep my boat speed to 2-4, seems line 2.8 is best i get. any help would be very appreciated, I also attach a couple photos to give you a idea of what i get. all these are on 455


Offline RGecy

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Re: Need help with 997, grainy images
« Reply #1 on: September 16, 2009, 10:12:20 PM »
George,
 
These images look pretty good to me! 
 
As for the 800khz, what is your depth and what is the SI range set to when you see the dark 1/2.  Remember, the 800khz has a smaller beam angle and therefore does not see out as far (depending on the depth) as the 455khz.  Basically, with 800khz, your range should be no more 2.5-3 times your depth.  So if you are 20' deep, the SI range should be no more than 60'.
 
http://forums.sideimagingsoft.com/index.php?topic=333.0
 
Hope this helps.  You may find that some settings will need tweaking depending on conditions.  Sediments and marine life can also affect image quality as well.  During the summer, marine life in the slat water is very abundant and creates a grainy affect on my images as well.
 
Overall, the images you posted for 455khz look pretty good.
 
Good Luck,
 
Robert
 
 
 
 
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Offline cbgeorge

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Re: Need help with 997, grainy images
« Reply #2 on: September 16, 2009, 10:23:32 PM »
what does the object in the  images look like to you?

Offline RGecy

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Re: Need help with 997, grainy images
« Reply #3 on: September 17, 2009, 12:32:48 AM »
Looks like a 1964 Ford Galaxie 2 Door Sedan!  ;D   Seriously!
 
Robert
 
 
« Last Edit: September 17, 2009, 12:45:10 AM by RGecy »
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IRC Kevin

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Re: Need help with 997, grainy images
« Reply #4 on: September 17, 2009, 12:01:15 PM »
Pictures look really good to me too. If it's any help, I've discovered that the best way for me to juggle the settings is to record my trips and then review it on the 997 on my return. You can adjust all the settings on playback and fiddle with them until you get the best picture, getting screenshots and marking waypoints as if you were running on the water in real time.

Offline RGecy

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Re: Need help with 997, grainy images
« Reply #5 on: September 25, 2009, 08:47:09 PM »
Charlie,

I say you go to the media and show them what you found. 

Is this a remote area that people just don't go to often?  Seems like you cold find a diver.  I am going to check scuba board and see if there are any divers in the area.

Here is a link to the post I put on ScubaBoard.  I also linked back to this post.

Robert
« Last Edit: September 25, 2009, 10:05:20 PM by RGecy »
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Offline RGecy

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Re: Need help with 997, grainy images
« Reply #6 on: September 25, 2009, 09:11:16 PM »
Charlie,

I didn't realize how close to Pittsburgh you are!  My family is from Pittsburgh!  Are you a Steeler Fan?

I am going to make a few phone calls and see who I can find to dive.

Robert
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Offline RGecy

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Re: Need help with 997, grainy images
« Reply #7 on: September 27, 2009, 12:10:30 PM »
Charlie,

I think I found a diver who is interested in checking out the site.  He wants to know a little more about it.  Location, visibility, current, etc.

Robert
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Offline Jolly Roger

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Re: Need help with 997, grainy images
« Reply #8 on: September 27, 2009, 02:45:52 PM »
Darn!
How much's a flight to Pennsylvania?
 ;)

Regards / Harry
YES,......
WE SCAN!

Offline RGecy

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Re: Need help with 997, grainy images
« Reply #9 on: September 27, 2009, 09:47:12 PM »
Charlie,

I posted your email over at ScubaBoard and one of the guys suggested you join over there to make contact easy.

There are several guys who are interested in helping out!

Good Luck and keep us informed!

Robert




« Last Edit: September 27, 2009, 09:48:59 PM by RGecy »
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Offline Mark997

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Re: Need help with 997, grainy images
« Reply #10 on: October 12, 2009, 12:54:03 PM »
My settings on 997c SI are TVG is on SI Enhance is 12,10, low sharpness. 2.8 mph speed sometimes it is just hard to know what some peices of structure are especially if they are man made. I try to zoom to 2x some of the time for a clearer picture.

Offline wizzo86

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Re: Need help with 997, grainy images
« Reply #11 on: October 12, 2009, 03:24:29 PM »
I have found the same problem. Robert suggested to me to lower my distance. Rule of thumb is distance of side scan be only 3 times the  depth you are scanning. The ducer only see's 105 degrees i'm told. When i tried that and kept my speed between 3 to 4mph with the boat on a steady course things became very clear. Hope this helps


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