Razvijanje črno-belega fotografskega filma s postopkom "push"

Čebašek, Matevž (avtor), Starešinič, Marica (mentor)

Fotografija predstavlja pomemben del našega vsakdana, brez katerega ne bi mogli živeti enako. Za njo je značilna skoraj identična reprodukcija sveta, kot jo je zmožno naše oko. V nekaterih primerih celo boljša. Do današnje kakovosti fotografije vodi dolga zgodovina, ki sega vse od Aristotela prek raziskovanja vpliva svetlobe in projiciranja svetlobe skozi majhno luknjico do nam prve znane fotografije, ki je nastala leta 1827. Pred digitalno fotografijo se je zvrstilo mnogo analognih postopkov, ki so pripeljali do srebro-halidnega fotografskega postopka. V teoretičnem delu naloge je srebro-halidni postopek predstavljen skupaj s pregledom zgodovine ključnih predhodnih postopkov. Opisani so materiali, potrebni za tak postopek, s poudarkom na fotografskem filmu in razvijalcu. V zadnjem delu so opisane možnosti vplivanja na stopnjo razvijanja, med katerimi je tudi podaljševanje časa razvijanja in povišanje temperature razvijalca. Tak postopek imenujemo postopek »push«, pri katerem se povečana stopnja razvijanja nadomesti s podosvetlitvijo fotografskega filma. Predstavljen je postopek razvijanja s podaljševanjem časa, ki smo ga opravili s šestimi različnimi razvijalci in petimi stopnjami podosvetlitve. Navedeni so vsi uporabljeni parametri osvetlitve in razvijanja posameznega vzorca. Vzorce smo primerjali in ugotovili, kateri razvijalec je primernejši za razvijanje filma s postopkom »push« oz. za razvijanje uporabljenega filma. Rezultati se razlikujejo po kontrastu, zrnatosti, dinamičnem razponu in ostrini. Rečemo lahko, da so rezultati subjektivni, saj je že samo dojemanje naštetih dejavnikov subjektivno. Rezultati so dobra iztočnica za vsakega posameznega fotografa, ki sprejema odločitev, kateri razvijalec bo uporabil za razvijanje filmov.

• Jezik: Slovenski jezik
• Ključne besede: analogna fotografija, razvijanje filma, srebro-halidni postopek, fotografski film, fotografski razvijalec, postopek »push«
• Vrsta gradiva: Diplomsko delo/naloga
• Organizacija: NTF - Naravoslovnotehniška fakulteta
• Leto izida: 2020
• PID: 20.500.12556/RUL-116939
• Datum objave v RUL: 17.06.2020

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Development of black and white photographic film with push processing

Izvleček

Photography represents an important part of our everyday, without which we could not live in the same way. It is characterized by an almost identical reproduction of the world as by our eye. In some cases, it is even better. Today’s quality of photographs arises from a long history dating back from Aristotle over researches about the impact of light and projection of light through a small hole to the first known photograph, made in 1827. Before digital photography, there were many analogue processes, which have led to the silver-halide photography process. In the theoretical part of the thesis, we presented the silver-halide process along with a historical review of crucial prior processes. We described materials, necessary for such a process, with emphasis on the photographic film and developer. In the final part, we described possibilities to influence the level of developing, among which are also the extension of developing time and increased temperatures of the developer. This is the so called push processing, where an increased level of developing is replaced with underexposure of the photographic film. Presented is the developing process with time extension, which we performed with six different developers and five levels of underexposure. Stated are all the used parameters of illumination and development of individual samples. We compared the samples and found, which developer is more suitable for the developing of the film with push processing or for the developing of the used film. The results differ in terms of contrast, grading, dynamic range and sharpness. We can say that the results are subjective, since already the very perception of the stated factors is subjective. The results are a good cue for each individual photographer, who decides, which developer to use to develop films.

• Ključne besede: analogue photography, film developing, silver-halide process, photographic film, photographic developer, push processing