Dear Pankaj ji
I did not know that Pankaj Sahni of Indian Angiosperm Taxonomy group is our
Dr. Pankaj Kumar.
The reply I gave there is reproduced here. I have been repeatedly requesting
members not to underestimate others knowledge.
Dear Mr Sahni
It is healthy to present ones views, but definitely not to think that others
on the group don't know the difference between digital image and digital
herbarium. We are here discussing the relative merits of a scanner and
digital SLR camera and not to comment on others knowledge.
Whereas it seems reasonable to think that because centered position
of camera lens, centre and edges of the herbarium may not focussed equally,
I think high resolution SLR and focussing taking care of depth of focus can
override this handicap. As for actual size criterian is concerned, I suppose
all images, whether created through Scanner or Digital camera ultimately get
reduced on digital screen of computer, and actual size would be meaningful
if scale is placed or created along side. I don't find any difference in
this aspect.
I have tried to find distinction between Virtual herbarium (term used
intitially) and digital herbarium, and find latter to be now the preferred
term for collection of digital images, whether through scanner or digital
camera.
Waiting to get more information
--
Dr. Gurcharan Singh
Associate Professor
SGTB Khalsa College, University of Delhi, Delhi-110007
Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
Phone: 011-25518297 Mob: 9810359089
http://people.du.ac.in/~singhg45/
On Sat, Feb 20, 2010 at 9:39 PM, Pankaj Kumar <[email protected]>wrote:
> I replied this on Indian Angiosperm Taxonomy group on yahoo and copying
> pasting the same thing here....hope this will be taken in good spirits......
>
>
> With due respects to all the seniors and friends, I just wanted to put up
> my view, that, there is a difference between 'digital herbarium' and
> 'digital image'. What you are taking from a digital camera is a digital
> image because the size of the image is not regulated. The picture that you
> are taking from a scanner, you fix it at 100% and the size what of the image
> you get is the actual size of the herbarium sheet. So just need to
> calibrate, and then you can even take measurements on the picture itself.
> There are few ideal digital herbaria available on the internet, where the
> image is attached with a software with which you can take measurements
> online too. Such facility is lacking in most of the other dig. herb.!
> When you take multiple shots of the plant concerned from different angles
> and details and then arrange it in a systematic manner, then it is called an
> 'illustration' .
>
> So for your convenience and for your records you can always have digital
> images and illustrations, yes offcourse it is convenient!
>
> Secondly, when you take a picture through digital camera, it is likely that
> the image gets distorted on the corners, and you dont get the actualy
> rectangular image, so you cant take or claim to have taken proper
> measurements using those images.
>
> Regards
>
> Dr. Pankaj Kumar
>
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