என் பெயர் Ryo
Cyanotype print successfully with "virtual negative" (6.08" monochrome 2K LCD) on photographic enlarger
Hybrid printing system:
A digital negative image appeared on a 6.08" genuine monochrome 2K LCD (no backlight itself, originally used for a 3D printer / no RGB sub-pixels), herein called "virtual negative", was successfully formed on cyanotype (or Van Dyke) photographic paper using an analog photographic enlarger (light source: 395 nm UV SMD). This virtual negative method differs in this respect from previous digital negatives on OHP film (contact printing) and analog negatives as attempted by group: www.flickr.com/groups/cyanotype_wenlarger/).
Image signal is output to the LCD via HDMI from a mini-PC (OS: Windows 10) with a built-in graphics board capable of up to 4K video output.
Due to differences in resolutions between those of image used and those processed in the LCD, the image needs to be rescaled in advance.
That is, in the sub-pixel direction, the LCD treats 3 pixels for each RCB channel as one monochrome pixel, so the original image in the sub-pixel direction must be resized by 3 times the number of pixels beforehand. For example, in the case of a 1620 x 2560 original image (2560 pixels in the sub-pixel direction), while not fixing the original aspect ratio, the 2560 pixels should be resized 3 times to 7680, and the resolution should be 505 (pixel/inch) and then converted to negative.
The condenser unit (= a unit in which two 16cm diameter convex lenses are set facing each other) was removed from my old Hansa patent enlarger for use in LPL Model 7451.
Due to the characteristics of the UV light source, such condenser unit is used instead of an original diffuser. Sufficient transmitted light can be given to the photographic paper surface for photosensitivity via the "virtual negative".
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Cyanotype print successfully with "virtual negative" (6.08" monochrome 2K LCD) on photographic enlarger
Hybrid printing system:
A digital negative image appeared on a 6.08" genuine monochrome 2K LCD (no backlight itself, originally used for a 3D printer / no RGB sub-pixels), herein called "virtual negative", was successfully formed on cyanotype (or Van Dyke) photographic paper using an analog photographic enlarger (light source: 395 nm UV SMD). This virtual negative method differs in this respect from previous digital negatives on OHP film (contact printing) and analog negatives as attempted by group: www.flickr.com/groups/cyanotype_wenlarger/).
Image signal is output to the LCD via HDMI from a mini-PC (OS: Windows 10) with a built-in graphics board capable of up to 4K video output.
Due to differences in resolutions between those of image used and those processed in the LCD, the image needs to be rescaled in advance.
That is, in the sub-pixel direction, the LCD treats 3 pixels for each RCB channel as one monochrome pixel, so the original image in the sub-pixel direction must be resized by 3 times the number of pixels beforehand. For example, in the case of a 1620 x 2560 original image (2560 pixels in the sub-pixel direction), while not fixing the original aspect ratio, the 2560 pixels should be resized 3 times to 7680, and the resolution should be 505 (pixel/inch) and then converted to negative.
The condenser unit (= a unit in which two 16cm diameter convex lenses are set facing each other) was removed from my old Hansa patent enlarger for use in LPL Model 7451.
Due to the characteristics of the UV light source, such condenser unit is used instead of an original diffuser. Sufficient transmitted light can be given to the photographic paper surface for photosensitivity via the "virtual negative".
----
New group was created. If you like, please join.