Running archived Android apps on a PC: first impressions

23 October 2014

Earlier this week I had a discussion with some colleagues about the archiving of mobile phone and tablet apps (iPhone/Android), and, equally important, ways to provide long-term access. The immediate incentive for this was an announcement by a Dutch publisher, who recently published a children’s book that is accompanied by its own app. Also, there are already several examples of Ebooks that are published exclusively as mobile apps. So, even though we’re not receiving any apps in our collections yet, we’ll have to address this at some point, and it’s useful to have an initial idea of the challenges that may lie ahead.


Six ways to decode a lossy JP2

26 September 2014

Some time ago Will Palmer, Peter May and Peter Cliff of the British Library published a really interesting paper that investigated three different JPEG 2000 codecs, and their effects on image quality in response to lossy compression. Most remarkably, their analysis revealed differences not only in the way these codecs encode (compress) an image, but also in the decoding phase. In other words: reading the same lossy JP2 produced different results depending on which implementation was used to decode it.

A limitation of the paper’s methodology is that it obscures the individual effects of the encoding and decoding components, since both are essentially lumped in the analysis. Thus, it’s not clear how much of the observed degradation in image quality is caused by the compression, and how much by the decoding. This made me wonder how similar the decode results of different codecs really are.


Jpylyzer software finalist voor digitale duurzaamheidsprijs

11 September 2014

Vandaag maakte de Britse Digital Preservation Coalition de finalisten bekend die in de race zijn voor de Digital Preservation Awards 2014. Deze prijs is in 2004 in het leven geroepen om aandacht te vestigen op initiatieven die een belangrijke bijdrage leveren aan het toegankelijk houden van digitaal erfgoed.


When (not) to migrate a PDF to PDF/A

27 August 2014

It is well-known that PDF documents can contain features that are preservation risks (e.g. see here and here). Migration of existing PDFs to PDF/A is sometimes advocated as a strategy for mitigating these risks. However, the benefits of this approach are often questionable, and the migration process can also be quite risky in itself. As I often get questions on this subject, I thought it might be worthwhile to do a short write-up on this.


How to save a web page to the Internet Archive

02 August 2014

This short tutorial shows how to take a snapshot of a web page, and save it to the Internet Archive’s Wayback Machine.



Search

Tags

Archive

2021

September

February

2020

September

June

April

March

February

2019

September

April

March

January

2018

July

April

2017

July

June

April

January

2016

December

April

March

2015

December

November

October

July

April

March

January

2014

December

November

October

September

August

January

2013

October

September

August

July

May

April

January

2012

December

September

August

July

June

April

January

2011

December

September

July

June

2010

December

Feeds

RSS

ATOM