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怀旧还是吓人

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isee Posted at 2014-8-27 23:43:04 |Read mode

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kuing Posted at 2014-8-28 00:23:21
回复 1# isee

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kuing Posted at 2022-7-17 12:59:13
是一个图片指向第2版论坛的我的头像,根据发帖时间也就是我2014年8月时所用的头像。

没记错的话,当时用的是一个“默认头像信号不好变形闪来闪去”的动图。(图已经找不到了,只能描述)

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kuing Posted at 2022-7-17 14:32:14
续楼上:
利用网站时光机翻看当时的论坛帖子,找到了该动图:
01_avatar_middle.jpg

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hbghlyj Posted at 2022-7-17 16:19:03
原来是旧式电视信号同步出了差错
电视信号一次发送 1 条水平线,并在屏幕上按顺序绘制,当到达底部时,它会返回停止并重新开始。

What causes the picture to roll over on old TV sets?

nickasummers · 8 yr. ago

Its eli5 so ill take a few liberties when it comes to reality. Also, I don't actually know TV tech, im a game developer and i heard an explaination of how this effect was intentionally achieved for a game, so this might not actually be why it DOES happen, but its certainly a way it could happen that shows how it isnt magic

Tv signals are sent 1 horizontal line at a time and drawn sequentially down the screen and when he bottom is reached it goes back to the stop and starts over. if it gets out of sync with incoming data, say, if it thought there were supposed to be 3 lines per picture when really there are 4, this happens:

frame 1

11111

22222

33333

frame 2

44444

11111

22222

Im honestly not sure how the desync happens, and the number of lines is, uh, significantly more than 3. also extra data coming in could concievably cause this:

frame 1

11111

02222

20333

33044

frame 2

44401

etc

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 Author| isee Posted at 2022-7-17 20:25:29
哈哈,链接失效竟然有空白效果
isee=freeMaths@知乎

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kuing Posted at 2024-1-9 03:49:24
hbghlyj 发表于 2022-7-17 20:29
图片链接失效默认是显示一个小的破碎的图片,但是Discuz有图片动态加载,它会显示一个旋转的箭头,补一 ...
我发现只要去掉 alt 这个属性之后“小破碎图片”就能出来。
我在 zdy3pc.js 里的 “Shift + 鼠标滚轮缩放 ... ” 那一段加了一句 item.removeAttribute("alt"); 现在 1# 就不是空白了。

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经测试,将 alt 设为非空字符串也行,此时这串字符会跟在小破碎图片后面  Posted at 2024-1-9 03:53
之前是 alt=""  Posted at 2024-1-9 04:07

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kuing Posted at 2024-2-22 15:16:14
Last edited by kuing at 2024-2-22 16:28:00
kuing 发表于 2024-1-9 03:49
我发现只要去掉 alt 这个属性之后“小破碎图片”就能出来。
我在 zdy3pc.js 里的 “Shift + 鼠标滚轮缩放 ...
gitee.com/Discuz/DiscuzX/blob/v3.5/upload/sou … _discuzcode.php#L659(本论坛是 L656)中
  1. $img = '<img id="aimg_'.$rimg_id.'" onclick="zoom(this, this.src, 0, 0, '.($_G['setting']['showexif'] ? 1 : 0).')" class="zoom"'.($width > 0 ? ' width="'.$width.'"' : '').($height > 0 ? ' height="'.$height.'"' : '').' '.$attrsrc.'="{url}" '.($extra ? $extra.' ' : '').'border="0" alt="" />';
Copy the Code

最后的 alt="" 设了空的 alt。(为什么要设置空的 alt?)
去掉它应该也可以,等会试试。
另外,border="0" 是不是已经不支持了?



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hbghlyj Posted at 2024-2-25 23:40:29
kuing 发表于 2024-2-22 07:16
另外,border="0" 是不是已经不支持了?

確實!我這裡無論是否設置border="0" 都顯示黑框。
Screenshot 2024-02-25 153958.png

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