Diptera.info :: Identification queries :: Diptera (adults)
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 Australian Tachinidae?
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| Graeme Cocks |
Posted on 31-08-2010 05:06
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 Member Location: Townsville, Australia Posts: 3083 Joined: 09.09.08 |
The first comment about this picture said it looked like it was created using a massively reduced colour palette. If that were the case then you will not be able to see the rainbow reflection on the wings. Can you? |
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| Graeme Cocks |
Posted on 31-08-2010 05:46
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Member Location: Townsville, Australia Posts: 3083 Joined: 09.09.08 |
Here is another interesting test. The pictures of Ochleratus vittiger are displayed on this page: http://www.boldsystems.org/views/taxbrowser.php?taxid=6436 Do they look like they are poor resolution? |
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| ChrisR |
Posted on 31-08-2010 14:21
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 Super Administrator Location: Reading, England Posts: 7706 Joined: 12.07.04 |
I'm going to have to get back to you - I am in and out at the moment and not always online ... Jorge might have some ideas in the meantime 
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| jorgemotalmeida |
Posted on 31-08-2010 15:45
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 Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
this must be a jpg highly compressed. Also having only around 70 kB decreases a lot the quality of the photo. Try to use a less compressed jpg and saving it as 190 kB, at least. Use adobe photoshop, the SAVE AS FOR WEB option in File menu. Also send to me some original photos - of this anthomyiidae fly - to my email. |
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| ChrisR |
Posted on 31-08-2010 17:38
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Super Administrator Location: Reading, England Posts: 7706 Joined: 12.07.04 |
I think it would help if Graeme could describe the process by which he makes the images - ie. which hardware and then which software it goes into. The photos in a lot of cases will be good enough for someone to give as good an ID as is possible from photos. but it would be nice to sort out the colour palette flattening that seems to be going on. If it was me I'd go into PhotoShop and then Import the image from the scanner and the Save for Web and make sure that the settings were for High quality JPEG images ... and see what happens. I noticed from a few of the images Graeme sent me that although the DPI is 2400 the quoted print size is tiny - less than 1 inch so these images are being blown up much greater than the scanned image would expect, so it might be something to do with what the scanner is doing at a low level ... ie. it would never expect an image to be enlarged this far so it wouldn't get spotted normally .... perhaps. That said, I know Malcolm Storey uses a scanner sometimes and his images don't seem to be all that flat so the process itself should be fine for creating good image ... we just have to find out what's causing the problems in Graeme's case
Edited by ChrisR on 31-08-2010 17:40 Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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