From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FROM,MAILING_LIST_MULTI, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 24972 invoked from network); 16 Jun 2023 16:08:34 -0000 Received: from minnie.tuhs.org (2600:3c01:e000:146::1) by inbox.vuxu.org with ESMTPUTF8; 16 Jun 2023 16:08:34 -0000 Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id D01E340C61; Sat, 17 Jun 2023 02:08:31 +1000 (AEST) Received: from mail-pg1-x529.google.com (mail-pg1-x529.google.com [IPv6:2607:f8b0:4864:20::529]) by minnie.tuhs.org (Postfix) with ESMTPS id 729C140BE2 for ; Sat, 17 Jun 2023 02:08:23 +1000 (AEST) Received: by mail-pg1-x529.google.com with SMTP id 41be03b00d2f7-54290603887so587296a12.1 for ; Fri, 16 Jun 2023 09:08:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1686931702; x=1689523702; h=cc:to:subject:message-id:date:from:references:in-reply-to :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=fn9JlhFWlBoLNOyIVYkZRWy7zWLqDktvG+UCeqMcQJM=; b=CH+SpxnifVPkXAcGTHdfhtnWFBH1UZaJcWcJSywAtHdro6T7L5yNSitlVCieq3GYEG f4Cccw+Nt9iAB8gTtQ8etqo6ohaFm44ME87dGYwD6LNId5HtrU0/1LXe1KDzlUKA75BU i6Vj3HdrKcDYkwcLlND8jNbHqH1aU9eDXg59dQiyxu71BBkRCp4UByU34EJqUa0pH8VS 169mQimy+bg/IOgBeUJcZI2n7MXAnklWFxkbuSfrmJNu8gKgE+Nb10A+hnme23bGG/j9 iywMSu5ddQVk2cw+Gu2HaaQgyw4N8QWDwpbu6EBVaNV4f1rjKPVuhdR9ECkwseFqy1fS Byhw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686931702; x=1689523702; h=cc:to:subject:message-id:date:from:references:in-reply-to :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=fn9JlhFWlBoLNOyIVYkZRWy7zWLqDktvG+UCeqMcQJM=; b=WX/j1EIe0wrBZ4JrS74ziLXDdZXtWNDD9AzlM9CmHELir5U2OxdRMABIbW08WxCSMk stjQcKlpk45VOhdnWDsIHlzT488OEdBdTbM2En1uk5snfPoMVpQiEB4Un3QrIMDtuNJa N7cp+iDWicN+0q+CSvQMpEawal08pqFzyqEBIBk9OSiJdrOmbpqnNmV23vpiSuC99zx/ SPoG1W4qcwE+rHGPrFpI9BmD50yVaFiysnGCKehZ2Anwnrp8gU75cm/cpg+zzA4TruT8 GKgXLm+aX654AeJcTsBMinjbxEr7Fkzsl6bhgiiZaAYb/NOip1y8yvhKCRWBEs2wb56e KXoQ== X-Gm-Message-State: AC+VfDwWtx7QhxJDaacEVYQhn3F4kgVWa8Ty7X/klgrM8WbOdhJaEDpv SvfF47yISSNDPXMVWkGCxGJQZyErHGRSISB0TOI5OaV9 X-Google-Smtp-Source: ACHHUZ5jtB1yCuec0uQHJTUR/2O/Q8nkGZcT3Y0jO9jz6TXBf1w98YTQIJAqBvkcYlEwZ0CY45NDebBT6D6MfNL7SBs= X-Received: by 2002:a17:90b:3ecd:b0:256:831b:8f45 with SMTP id rm13-20020a17090b3ecd00b00256831b8f45mr1981410pjb.16.1686931701959; Fri, 16 Jun 2023 09:08:21 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a05:6a10:4b06:b0:4c1:7ec0:eb04 with HTTP; Fri, 16 Jun 2023 09:08:21 -0700 (PDT) In-Reply-To: References: From: Paul Winalski Date: Fri, 16 Jun 2023 12:08:21 -0400 Message-ID: To: segaloco Content-Type: text/plain; charset="UTF-8" Message-ID-Hash: WDYZEXMSE2F27EPGSGYVSHLR5KDEG4VT X-Message-ID-Hash: WDYZEXMSE2F27EPGSGYVSHLR5KDEG4VT X-MailFrom: paul.winalski@gmail.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: COFF X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [COFF] Re: White Backgrounds on GUIs after Dark Backgrounds on Terminals? List-Id: Computer Old Farts Forum Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On 6/15/23, segaloco via COFF wrote: > > So terminals, they started as typewriters with extra steps, a white piece of > paper on a reel being stamped with dark ink to provide feedback from the > machine. When video terminals hit the market, the display was a black screen > with white, orange, green, or whatever other color of phosphor they bothered > to smear on the surface of the tube. Presumably this display style was > chosen as on a CRT, you're only lighting phosphor where there is actually an > image, unlike the LCD screens of today. So there was a complete contrast > shift from dark letters on white paper to light letters on an otherwise > unlit pane of glass. The phosphors on CRT screens don't last forever. You only want to light them when necessary. CRTs also suffer from the problem of burn-in. If you keep the same picture illuminated for a long period of time that pixel pattern gets burned into the phosphors. This is why the later GUI CRTs had screen saver software that displayed an ever-changing picture to prevent burn-in. This isn't a problem with the modern, non-cathode-ray displays. Good ol' flying toasters. -Paul W.