{"id":421,"date":"2018-09-26T05:28:19","date_gmt":"2018-09-26T09:28:19","guid":{"rendered":"https:\/\/langa.com\/?p=421"},"modified":"2018-09-24T15:00:32","modified_gmt":"2018-09-24T19:00:32","slug":"a-reader-asks-can-you-see-a-rainbow-on-a-black-and-white-photograph","status":"publish","type":"post","link":"https:\/\/langa.com\/index.php\/2018\/09\/26\/a-reader-asks-can-you-see-a-rainbow-on-a-black-and-white-photograph\/","title":{"rendered":"A reader asks: Can you see a rainbow on a black-and-white photograph?"},"content":{"rendered":"

Q. Can you see a rainbow on a black-and-white photograph?<\/strong><\/p>\n

A. Yes,<\/strong>\u00a0but the colors will appear as shades of gray, same as with any other object photographed in black-and-white.<\/p>\n

There’s nothing special about rainbow colors — often listed as red, orange, yellow, green, blue, indigo, and violet. Those colors react with black and white film or digital sensors the same as those colors do with color film or sensors.<\/p>\n

By analogy: You can photograph a red apple or a blue sky or green grass in black-and-white, right? They simply appear as shades of grey. Same with a rainbow: In black and white, you’ll see the rainbow as a grey arc.<\/p>\n

Example, from Introduction to Black and White Nature Photography<\/a>:<\/p>\n

\"\"<\/p>\n

\n

Permalink: https:\/\/wp.me\/paaiox-6N<\/a><\/em><\/p>\n

Ask me anything! Click the CONTACT<\/a> link on any page.<\/em><\/p>\n

Share this item via the links below:<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Q. Can you see a rainbow on a black-and-white photograph? A. Yes,\u00a0but the colors will appear as shades of gray, same as with any other object photographed in black-and-white. There’s nothing special about rainbow colors — often listed as red, orange, yellow, green, blue, indigo, and violet. Those colors react with black and white film…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[7,10],"tags":[],"class_list":["post-421","post","type-post","status-publish","format-standard","hentry","category-a-reader-asks","category-science-and-tech"],"aioseo_notices":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paaiox-6N","jetpack-related-posts":[{"id":571,"url":"https:\/\/langa.com\/index.php\/2018\/10\/07\/a-reader-asks-do-trees-change-colors-at-the-same-time-every-fall\/","url_meta":{"origin":421,"position":0},"title":"A reader asks: Do trees change colors at the same time every Fall?","author":"Fred Langa","date":"2018-10-07","format":false,"excerpt":"Q. Do trees change colors at the same time every Fall or do they change according to weather? (via Quora) A: Nope. It\u2019s highly variable. Trees are living things, so a tough summer with too little or too much rain, or too high or too low temperatures, or events like\u2026","rel":"","context":"In "A reader asks..."","block_context":{"text":"A reader asks...","link":"https:\/\/langa.com\/index.php\/category\/a-reader-asks\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1568,"url":"https:\/\/langa.com\/index.php\/2019\/01\/06\/a-reader-asks-how-bad-is-the-traffic-in-boston-ma\/","url_meta":{"origin":421,"position":1},"title":"A reader asks: “How bad is the traffic in Boston, MA?”","author":"Fred Langa","date":"2019-01-06","format":false,"excerpt":"As with any city, there are places and times when traffic is bad; and places and times when it's not. Without more specificity to your question, it's really not answerable. But here's how you can find out: Open Google Maps for Boston, and enable the traffic layer; Google Maps will\u2026","rel":"","context":"In "A reader asks..."","block_context":{"text":"A reader asks...","link":"https:\/\/langa.com\/index.php\/category\/a-reader-asks\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/langa.com\/wp-content\/uploads\/2019\/01\/Boston-traffic.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/langa.com\/wp-content\/uploads\/2019\/01\/Boston-traffic.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/langa.com\/wp-content\/uploads\/2019\/01\/Boston-traffic.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/langa.com\/wp-content\/uploads\/2019\/01\/Boston-traffic.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":2342,"url":"https:\/\/langa.com\/index.php\/2019\/03\/15\/a-reader-asks-is-it-enough-to-disable-the-driver-for-the-camera-on-my-laptop-and-to-put-tape-over-it\/","url_meta":{"origin":421,"position":2},"title":"A reader asks: “Is it enough to disable the camera driver for my laptop, and to block the lens?”","author":"Fred Langa","date":"2019-03-15","format":false,"excerpt":"Reader Steven Clifford Cohen asks: \"I disabled the driver for the camera on my laptop. I also put tape over it. Is that enough?\" Enough to prevent video-based snooping, sure. But opaque tape alone would do that; a camera can't see through an opaque object, period. However, if you're really\u2026","rel":"","context":"In "A reader asks..."","block_context":{"text":"A reader asks...","link":"https:\/\/langa.com\/index.php\/category\/a-reader-asks\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/langa.com\/wp-content\/uploads\/2019\/03\/webcam-covers-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/langa.com\/wp-content\/uploads\/2019\/03\/webcam-covers-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/langa.com\/wp-content\/uploads\/2019\/03\/webcam-covers-1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":472,"url":"https:\/\/langa.com\/index.php\/2018\/09\/24\/a-reader-asks-how-do-i-fix-an-operating-system-not-found-message\/","url_meta":{"origin":421,"position":3},"title":"A reader asks: How do I fix an ‘operating system not found’ message?","author":"Fred Langa","date":"2018-09-24","format":false,"excerpt":"Q: How do I fix the \"an operating system wasn't found\" screen, with all the words are mixed up and the screen is white and twitching?\u00a0 (via Quora) A: An \"Operating System Not Found\" or \"Missing Operating System\" or similar message will occur when you boot\/start\/restart a PC, but something\u2026","rel":"","context":"In "A reader asks..."","block_context":{"text":"A reader asks...","link":"https:\/\/langa.com\/index.php\/category\/a-reader-asks\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1019,"url":"https:\/\/langa.com\/index.php\/2018\/11\/10\/1019\/","url_meta":{"origin":421,"position":4},"title":"A reader asks: Is there good hiking around Boston accessible by public transit?","author":"Fred Langa","date":"2018-11-10","format":false,"excerpt":"Reader Patti McIntyre asks: \"What are some good hiking spots around Boston that I can access by public transportation?\" Some of my favorites: Middlesex Fells Reservation, 2,200 acres (890 ha) of woods, hills, and lakes north of the city. Many access points; depending on where you want to go, you\u2026","rel":"","context":"In "A reader asks..."","block_context":{"text":"A reader asks...","link":"https:\/\/langa.com\/index.php\/category\/a-reader-asks\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":427,"url":"https:\/\/langa.com\/index.php\/2018\/09\/19\/a-reader-asks-how-many-keyboard-keys-are-being-pressed-at-the-same-time-in-the-world\/","url_meta":{"origin":421,"position":5},"title":"A reader asks: How many keyboard keys are being pressed at the same time, in the world?","author":"Fred Langa","date":"2018-09-19","format":false,"excerpt":"Q: How many keyboard keys are pressed at the same second in the world?\u00a0 (via Quora) A: A very rough guess: humans currently generate 416 million keystrokes per second. Here\u2019s the (admittedly shaky) logic --- feel free to adjust up or down as you wish: Assuming you mean physical keyboards\u2026","rel":"","context":"In "A reader asks..."","block_context":{"text":"A reader asks...","link":"https:\/\/langa.com\/index.php\/category\/a-reader-asks\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_likes_enabled":false,"_links":{"self":[{"href":"https:\/\/langa.com\/index.php\/wp-json\/wp\/v2\/posts\/421","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/langa.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/langa.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/langa.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/langa.com\/index.php\/wp-json\/wp\/v2\/comments?post=421"}],"version-history":[{"count":4,"href":"https:\/\/langa.com\/index.php\/wp-json\/wp\/v2\/posts\/421\/revisions"}],"predecessor-version":[{"id":426,"href":"https:\/\/langa.com\/index.php\/wp-json\/wp\/v2\/posts\/421\/revisions\/426"}],"wp:attachment":[{"href":"https:\/\/langa.com\/index.php\/wp-json\/wp\/v2\/media?parent=421"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/langa.com\/index.php\/wp-json\/wp\/v2\/categories?post=421"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/langa.com\/index.php\/wp-json\/wp\/v2\/tags?post=421"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}