Sensitometry

✍ Scribed by Baines, H.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1931
• Weight: 956 KB
• Volume: 50
• Category: Article
• ISSN: 0368-4075
• DOI: 10.1002/jctb.5000503402

✦ Synopsis

The rnnge of problems encountered by a chemist employed in tlie photogrnphic industry necessitates proficiency not only in physical, organic, inorgnnic, and annlytical chemistry; such n chemist must also become thoroughly acqunintcd with the science of sensitometry, of which subject this pnpcr gives a brief outline.

The object of photography is the production by chcmiciil nncl physicnl means of n picture mliich, when viewed by tlie liumnn eye, will tis fnitlifully as possible reproduce the originnl scene.* Ordinary photographic mnterinl, esposcd in an ordinnry cnniern, can never fully achieve this object, since it suffers at the outset from two serious disnclvantagcs. First, it cannot reproduce colours, and, secondly, since the caiiiera uses one lens to produce one image only, it cannot record tlie stereoscopic effect obtnined by tho use of two eyes. At best, therefore, it cnn only rcproduce a view ns n composition of briglitncsscs, shndes, or '' tones, " s i d l ns would be seen by n one-eyed, colour-l)lintl mnn.

It seems natural to nssume thnt n perfect photo-* E:sirci rolir~itliiclioii I I I I I ~ IIOC i i l ~i p 110 tlt.nirctl. i'ortions of 11 v i w iiiny Iin IlUr[lCJhdj' c*riiiiIiiiniRriI or H l l p l ) ~C f i H ( ~( l ill orilur 10 (*OII'OY soiiic pic.loriirl iiiilirt*nniiin, 1,111 thin ]iHIJ(*(*t fallR c,li(sitlo the. hcuiiu of niir prcmit ciiiinitlcrcitiiinq.