====== Differences ====== This shows you the differences between two versions of the page.
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peripherals:camera:timelapse [2016/06/21 04:18] admin [4- Process files on the Raspberry Pi] |
peripherals:camera:timelapse [2017/03/01 18:52] (current) admin [Convert / Modify images before combining] |
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| We now have a //my_timelapse.mp4// movie which is full HD (1920×1080). | We now have a //my_timelapse.mp4// movie which is full HD (1920×1080). | ||
| + | |||
| + | ==== Convert / Modify images before combining ==== | ||
| + | ---- | ||
| + | |||
| + | Sometimes it may be suitable to adjust,convert or otherwise modify images before they are integrated as a movie. | ||
| + | |||
| + | [[https://www.imagemagick.org/script/convert.php|ImageMagick]] offers a set of command line tools that can be used to manipulate images from the command line. In the following example, we're going to ''convert'' all captured images to grayscale, it's also called desaturate. Therefore, we'll be using the imagemagick ''[[https://www.imagemagick.org/script/convert.php|convert]]'' command. To enhance the output result, we'll also make use of the ''-normalize'' option. | ||
| + | |||
| + | Here is how to **convert a single file**: | ||
| + | <Code:bash|Single file conversion> | ||
| + | > convert my_originals/img01.jpg -colorspace Gray -normalize my_converted/img01.jpg | ||
| + | </Code> | ||
| + | |||
| + | Here is how to **batch convert multiple files** at once: | ||
| + | <Code:bash|Multiple files conversion> | ||
| + | > cd my_originals/ | ||
| + | > for f in *.jpg ; do convert "$f" -colorspace Gray -normalize "../my_converted/$f" ; done | ||
| + | </Code> | ||
| + | |||
| + | Another interesting usage of ImageMagick here would be to "water mark" all images before integrating them into the movie, your timelapses can be "signed" using this method. | ||
| ==== MP4 Optimization for Web Streaming ==== | ==== MP4 Optimization for Web Streaming ==== | ||
| ---- | ---- | ||
