Color values in monochrome [microform] : a lecture on orthochromatic photography delivered before the Canadian Institute, February 16th, 1901
Color values in monochrome is a 1901 lecture by J. S. Plaskett, delivered before the Canadian Institute in Toronto, on orthochromatic photography and how colours translate into black and white tones. Its pictures are halftone photographs of a colour test chart, with a ring of coloured segments, a central bar pattern and squares, shown on different plates and screens, so a designer can compare how each filter renders the same hues as grey values.
![Picture 1 of 8 from Color values in monochrome [microform] : a lecture on orthochromatic photography delivered before the Canadian Institute, February 16th, 1901 (1901), leaf 9](https://img.insideoutlibrary.com/img/200/ia-cihm_72137-9-0.webp)
![Picture 2 of 8 from Color values in monochrome [microform] : a lecture on orthochromatic photography delivered before the Canadian Institute, February 16th, 1901 (1901), leaf 9](https://img.insideoutlibrary.com/img/200/ia-cihm_72137-9-1.webp)
![Picture 3 of 8 from Color values in monochrome [microform] : a lecture on orthochromatic photography delivered before the Canadian Institute, February 16th, 1901 (1901), leaf 21](https://img.insideoutlibrary.com/img/200/ia-cihm_72137-21-0.webp)
![Picture 4 of 8 from Color values in monochrome [microform] : a lecture on orthochromatic photography delivered before the Canadian Institute, February 16th, 1901 (1901), leaf 27](https://img.insideoutlibrary.com/img/200/ia-cihm_72137-27-0.webp)
![Picture 5 of 8 from Color values in monochrome [microform] : a lecture on orthochromatic photography delivered before the Canadian Institute, February 16th, 1901 (1901), leaf 32](https://img.insideoutlibrary.com/img/200/ia-cihm_72137-32-0.webp)
![Picture 6 of 8 from Color values in monochrome [microform] : a lecture on orthochromatic photography delivered before the Canadian Institute, February 16th, 1901 (1901), leaf 34](https://img.insideoutlibrary.com/img/200/ia-cihm_72137-34-0.webp)
![Picture 7 of 8 from Color values in monochrome [microform] : a lecture on orthochromatic photography delivered before the Canadian Institute, February 16th, 1901 (1901), leaf 35](https://img.insideoutlibrary.com/img/200/ia-cihm_72137-35-0.webp)
![Picture 8 of 8 from Color values in monochrome [microform] : a lecture on orthochromatic photography delivered before the Canadian Institute, February 16th, 1901 (1901), leaf 35](https://img.insideoutlibrary.com/img/200/ia-cihm_72137-35-1.webp)