Raspberry Pi Forums

keithellis

In addition, if you turn the cobbler round 180 degrees the +5 and +3.3 will be on the red rails of the breadboard and avoid confusion.

keithellis

To get the mode of image im

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im.mode ⇒ string

Image mode. This is a string specifying the pixel format used by the image. Typical values are “1”, “L”, “RGB”, or “CMYK.” See Concepts for a full list.

keithellis

See this page http://effbot.org/imagingbook/concepts.htm
Try reading the 'mode' of the image and see what it returns. If it returns 'RGB' it should be working, if it returns something else maybe that is why you are getting the error.

Keith.

keithellis

Just shooting int he dark here, but on the site http://effbot.org/imagingbook/imagechops.htm it states At this time, most channel operations are only implemented for 8-bit images (e.g. “L” and “RGB”). could this be your problem? Keith. Am a beginner, what do you suggest i do ? i want to compare the...

keithellis

Just shooting int he dark here, but on the site http://effbot.org/imagingbook/imagechops.htm it states

At this time, most channel operations are only implemented for 8-bit images (e.g. “L” and “RGB”).

could this be your problem?

Keith.

keithellis

I'm not familiar with what you are doing but should the line after your error

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my_view2 = Viewer(img.width, img.height, "compare")

actually be

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my_view2 = Viewer(img2.width, img2.height, "compare")

Just to be consistent.

keithellis

Have you run

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sudo raspi-config

and then selected option 1 to expand the file system to fill up the SD card? If you you need to do this.

keithellis

Yes, assign a password to the root account and take out your ability to use sudo and use su. Yes I have assigned root a password, but I want to use sudo with the new account so have enabled this. The question I asked was if I needed to assign any other permissions to my new user account to replicat...

keithellis

You also should probably make it so root can't logon to the pi. I did it and I can always ssh as a user (not pi) and sudo any root item. If I really need to be root, I can su to root, but sudo is safer. Here are some instructions on how to disallow root to log on via ssh: http://www.howtogeek.com/h...

keithellis

I recently bought a Raspberry Pi to accompany me with learning computing (Python and C+), I have at hand only an older TV with Scart and the 3 connectors (left and right audio and video, red, white and yellow). I have recently bought this cable to go with the Pi: http://www.amazon.co.uk/gp/product/...

keithellis

If you order a serial console cable now, you could have it for the weekend, Console cable can be used with Windows, Mac or Linux, so versatile. Allows you to effectively 'SSH' in without need for any network.

keithellis

Thanks Richard, So since I have not created a password for root it is not possible to log in as root, therefore any hacker would have to know my pi password. Just wanted to make sure there was not a way to bypass the pi account. I might create a new user though and lock pi user as you suggest. Keith.

keithellis

I would get a USB Console cable like this https://www.modmypi.com/USB-to-TTL-Serial-Cable-Debug-Console-Cable-for-Raspberry-Pi?filter_name=console It is very useful for debugging problems such as this. They only cost £6-7 I have a video tutorial showing how to setup a Pi headless using one of these,...

keithellis

Just a follow up question then on security.
I like to keep things secure so I have changed my pi password. I have not set a password for root. Could someone still access my pi or should I set a password for root also?

keithellis

Odd. I dug up a keyboard and HDMI cable, rebooted and was presented with the raspi-config screen, which i guess runs after initial install. After exiting the config screen and rebooting everything works as it should. My problem is very reproducible though and this really shouldn't happen. especiall...

keithellis

I want to figure out the easiest way to setup wifi networking on a headless Pi that has no user-accessible I/O apart from wifi. By "easy" I mean easy to explain to someone who hasn't used a Pi before. The only thing I can think of so far is for the Pi to start out as a wifi hotspot itself...

keithellis

Excellent, glad you sorted it out. I've bookmarked this post, since I have a feeling I will need this soon.

Thank you.
Keith.

keithellis

Excellent step by step guide - I knew buying one of those USB console cables would come in handy one day This could be very useful to change wifi network settings when using my RPi away from home or my schools :) Its always nice to find out stuff that's been around for ages but that hasn't been pub...

keithellis

Cheers Andy,

My first one, hope it will be useful.
Keith.

keithellis

Cheers Simon,

I'm hoping to do a few more tutorials, though time is always a bit of an issue. Glad you liked it.
The console cable is such a useful bit of kit and zero setup on the Pi is great. It also enabled me to screen capture the boot sequence, which I haven't seen before.

Keith.

keithellis

simplesi wrote:Stop keeping us in suspense

Simon

Video Tutorial is done, its just gone up on YouTube, link here http://bit.ly/1b7Rd5C. Hope its useful.

keithellis

Hi there, just to let you know, I've finished my video tutorial, it is now live on YouTube, link here http://bit.ly/1b7Rd5C

keithellis

Thanks Keith, I have an Edimax WiFi adaptor on it's way. I think I will need all the advise I can get. I'm not at all familiar with networking so I think this could be a challenge. It would be nice to have internet access on the laptop at the same time but I can always use my tablet for that. Will ...

keithellis

I would like to create a program on my Raspberry Pi that sends the same text message to multiple people every weekday. That text message would change daily and constantly repeat itself like the standard A/B day schedule of schools. I would also like to send that text message for free. How would I d...

keithellis

simplesi wrote:This would be excellent for people who take their RPi around different venues/schools

Looking forward to seeing your info on how to do it

Simon

I've been working on the tutorial over the last couple of nights, hope to have it online by the weekend.

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