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Posts Tagged ‘image’

If you’ve recently upgraded to 10.10 “Maverick Meerkat”, you will notice that when you double-click an .iso disc image file, it will want to create an image checksum (for data verification) before it burns the disc. For most of us, this is annoying, as it needlessly adds time to the burning process.

What’s worse is that once the image has been burned to disc, it will want to do it all over again, even though it apparently does not even compare the first checksum with the final one.

If you’ve tried the Preferences button before burning the image only to find nothing useful, the answer can be found by opening the main program window (Applications > Sound & Video > Brasero Disc Burner), and going to Edit > Plugins.

You will see 2 plugins related to checksum creation/verification: File ChecksumEnables Brasero to check the integrity of files“, while Image ChecksumEnables Brasero to perform integrity checks on discs after they have been burnt. Also enables the writing of a small file which holds the MD5 sum of all the files on the disc“.

Now, in my situation the Image Checksum doesn’t seem to do anything but waste time. In theory, having it create a checksum file and sticking it on the disc for later verification seems a great idea, but I’m personally wary of that as it could render some bootable discs useless. Luckily, from what I have seen, it does nothing of the sort, and it seems no checksum file is created anywhere, meaning this plugin is really just wasting your time.

But simply uncheck the Image Checksum plugin to disable it, and your burn process will go back to how it was.

Extra Notes:

You can also uncheck the File Checksum plugin, since it is much simpler verifying data discs via the terminal, but this is not vital.

If you actually find this plugin useful, you can choose the SHA1 or SHA256 hashing algorithms instead of the default MD5, simply by clicking Configure.

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Nautilus Image Converter is a plugin or extension for Ubuntu‘s file manager that lets you quickly and easily resize and rotate image files. Once installed, all you have to do is right-click a picture file, or a group of them, and choose either “Resize Images…” or “Rotate Images…“.

In the Resize Images dialogue you can choose from predefined sizes via “Select a size:” (96×96 & 128×128 for thumbnails or avatars, as well as wallpaper dimensions for older 4:3 screen resolutions 640×480, 800×600, 1024×768 & 1280×960), “Scale:” it to a certain percentage, or choose your own “Custom size:“.

You will note that for “Append” the default is to save these altered images as copies with .resized added to the file name. You can choose “Resize in place” instead, but note that this overwrites the original, so use with caution.

With the Rotate Images dialogue, you can choose from 3 predefined angles via “Select an angle:“, being 90° clockwise, 90° counter-clockwise and 180°. If you need a bit more precision than that, just define your own angle with “Custom angle:“.

Like the resizer, the default behaviour is to save the output as a copy, this time with .rotated appended to the file name, though you can choose “Rotate in place” to overwrite the original.

This handy little plugin is installed very easily via Synaptic, but even quicker is to enter the following into a terminal:

sudo apt-get install nautilus-image-converter
The image converter options will be available in the context menu after a reboot, or you can log out and back in again if you want the changes to take effect immediately.

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Click here for more Nautilus Extensions!

Guide to Customising & Enhancing Nautilus

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Did this information make your day? Did it rescue you from hours of headache? Then please consider making a donation via PayPal, to buy me a donut, beer, or some fish’n’chips for my time and effort! Many thanks!

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Please note that this is for the “legacy” version of GRUB still widely in use, not the next-generation GRUB 2. If unsure, check out this guide on how to find out which version of GRUB you are using.

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You can actually add a picture to the GRUB boot menu, but these are special pictures that are compressed and have the extension .xpm.gz. First you’ll need some splash images, so go here and search for “grub”, and save them all in a folder of your choice. You will then need to create a new folder called images in GRUB’s residence, which you do by entering the following into a terminal:

sudo mkdir /boot/grub/images/

To copy all bootsplash files to this new protected folder, open a terminal in the folder you saved the splashes in and enter:

sudo cp *.xpm.gz /boot/grub/images/

If just wanting to copy one file over, you can replace the asterisk (*) with the file name. Note that these files must be .xpm images that have been compressed and so have the extension .xpm.gz (in other words, do not extract the picture from within).

To edit menu.lst to incorporate the image of your choice, enter the following into a terminal:

sudo gedit /boot/grub/menu.lst

then add the following lines at the very top of the file (or change the file name if it already exists):

# Splashimage for Bootloader Background
splashimage=(hd0,1)/boot/grub/splashimages/mygrubsplash.xpm.gz

Note that you may need to substitute your Ubuntu partition’s  correct address for (hd0,1), and that the GRUB system of naming drives and their partitions is different to that of Linux. Whenever you want to switch between boot menu images, simply edit menu.lst again and replace the name before the .xpm.gz with that of the replacement picture.

Want to know how to go a step further? Create your own GRUB boot splash!

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Did this information make your day? Did it rescue you from hours of headache? Then please consider making a donation via PayPal, to buy me a donut, beer, or some fish’n’chips for my time and effort! Many thanks!

Buy Ubuntu Genius a Beer to say Thanks!

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