Respected Gurcharan Sir, Seems I have been making enemies more than friends. Frankly speaking, I never underestimated your knowledge on anything. I really admire your patience for every thing on this group through which I know you...may be I wont be able to make you believe because I never want others to believe me. Its upto them, if they dont then I am not loosing anything....
Some people have this self made impression of mine, for which I cant help. Here is another reply form me there.... I will surely try to share some sample pics from our scanner. PLUS: Just incase you have heard of DRUM SCANNERS, that is supposed to give best results, much better than the FLATBED SCANNERS which uses CCD censors. But they are very costly. ------------------ Respected Gurcharan Sir No, you cannot override the abberation caused by a SLR lens towards the edges. One simple way to experiment is to take a picture of a graph paper and see towards the edges. One way to minimise the abberation is taking pictures from a distance. Like keep the image on the central 1/9th part of the viewfinder and try. But images will be comparatively smaller, 1/9th of the original picture size from the particular camera. Regards Pankaj --------------- Just for your information, we have this scanner at our office for A3 sized herbarium sheets "EPSON EXPRESSION 10000XL" and it works out well. I have tried it myself. I tried it on smaller flowers. There is an option of focussing the lens too in this, so you can get good results. I will try to post some pics from it....hopefully you all will like. But sure there should be much better scanners available in market as the technology advances day by day. Regards Pankaj ------------------- On Sat, Feb 20, 2010 at 10:08 PM, Gurcharan Singh <[email protected]>wrote: > 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 >> > > > > -- You received this message because you are subscribed to the Google Groups "efloraofindia" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/indiantreepix?hl=en.
