Today started very pleasantly with sun and light winds, although became overcast by lunchtime, but thankfully still dry. The muddy remains of the deluges of previous days are now largely cleared away from site surfaces and we are down to midden layers across most of the main trench. The trench has now been allotted various sample areas to provide detailed insights into the midden layers, which are getting blacker as we go down through them. The main enclosure ditch where it crosses through this trench has been cross-sectioned, with a grey charcoal-flecked soil filling its upper layer. At the other end of the trench, not far from the spring and pool at the centre of the enclosure, the location of a single, important human burial found deep under the midden in a previous season (2001) is being explored and the backfill of the old trench above it is being removed.

Two smaller trenches are revealing details of the enclosure defences and ditches. One on the western side shows an interesting stepped profile to the ditch, almost as if those digging it were progressively deepening it as it crossed over the limestone scarp. Another long, narrow trench on the north-eastern side of the enclosure was started two days ago to test a possible double-ditch type anomaly which was noticed on the geophysics. This has proved to be correct, with two ditches crossing this trench. Work is now under way to establish their depth and extent, and hopefully to clarify whether one is earlier than the other.   

Today is my last day on site as I am only able to supervise for the first half of the four week excavation season. It has been an extremely enjoyable and nostalgic return for me to dig on a favourite site with old friends, having been part of the site team here in the 1996-99 seasons. The weather this time has been less than brilliant, but we have had quite a few nice days amidst the rainy ones, and the forecast is now good. The student team (from Cardiff and Bangor universities) is excellent, at least as good as any we have had in previous seasons. I strongly suspect the most interesting discoveries of this season will now occur in the next two weeks! I will be watching this blog with interest.

DAVID GRIFFITHS

After two weeks of hard work by all the team to remove ploughsoil, and backfill from previous years’ excavation, the archaeological remains are finally being examined in detail. 

Today, one discovery brought the entire site to a halt, bringing everyone to gather around one of the smaller exploratory trenches opened last week.  Following clearing rubble from the upper fill of the enclosure ditch, the longbone of a burial was found on the western side of the enclosure ditch.  It is hoped that this exciting discovery will provide more information relating to a group of five skeletons previously found immediately to the south during the excavation seasons of 1998 and 1999. 

Weather conditions on site are currently excellent for the detection of archaeological features.  This is exemplified by the discovery of a several archaeological features within an area previously excavated in 1998 at the east end of the main trench.  Some of these features were previously known from the earlier season, but remained unexcavated because of a lack of time. 

Elsewhere in the main trench, the team has uncovered more of the enclosure wall defining the western boundary of the site, and have also begun the excavation of a slot through the enclosure ditch adjacent to that wall.  Exploratory slots placed through midden deposits at the east end of the trench are finding animal bones in large quantities, which will provide valuable dietary information about the inhabitants of the site. 

These tantalising glimpses into the archaeology of the site are getting everyone very excited, and we look forwards to seeing what new discoveries await us during the next two weeks.

Tudur Burke Davies

Graham Davies, Online Curator, Amgeddfa Cymru - National Museum Wales

Earlier this year I was approached by the Keeper of Art regarding a recent acquisition of two oil paintings dating from 1700. The paintings in question - two large panoramic paintings of Margam House - were purchased with help from the Heritage Lottery Fund and the Art Fund, and as the funding included some form of digital exploration, I was asked to produce an interactive to compliment the gallery display (that would also be available to tour with the paintings).

On closer inspection of the paintings, lot of small, intricate detail became noticeable.  As some details were very small - and would benefit from additional interpretation - some sort of zoomable image would offer the visitors with the best form of digital exploration.

In previous gallery interactive developments, the New Media Department have used the iPad2 platform, but as the newer iPad3 has a retina display - a screen resolution and pixel density so high that a person is unable to discern the individual pixels at a normal viewing distance - this platform seemed ideal to explore small detail in high resolution images. As for the software, we decided to use an adaptation of a previously developed interactive that allowed the user to move around a high-resolution image to predetermined hotspots (to explain certain details of the painting).

I then went about locating numerous details on the canvas that would be interesting and informative to the viewer. I was keen to pick things out that would not be contained on the gallery labels, thus ensuring no duplication and offering an enhanced visitor experience.

Resolution issues

After obtaining high-resolution images of the two paintings I was able to upload these to our Content Management System (amgeuddfacms), to allow them to be served from our website server. It was at this point that a strange technical inconsistency occurred....

Viewing a 3800 pixel wide image on a standard Firefox browser on my desktop screen rendered the image sharp and clear. However, serving the exact same image into the iPad3 web browser rendered a fuzzy pixelated image. Given that the same image was being served to both screens it seemed that the different web browsers were handling the image in a different way.

A little bit of research on the internet revealed the possible problem: The default web browser on an iPad (Safari), runs WebKit which only seems to serve images up to a maximum size (somewhere around 1024 pixels wide). The iPad browser seemed to be downsampling the original 3800 wide image to 1024 wide, before then upscaling this 1024 wide image back up to 3800, causing the image to render at almost 400% it's downsampled 1024 pixel size.

The problem was how to get around this. After some researching on the internet for similar problems, it seemed that there was no conclusive solution. This was mainly due to the logical assumption that it’s bad practice to serve huge images to a website (especially on a mobile device such as an iPad, where web content was readily downloaded via mobile networks), so the advice was always to use small images. Of course we wanted very large images, so this didn’t help!

One solution that Chris Owen, our Web Manager came up with was to serve two halves of the image separately and automatically stitch them back together again after they loaded on the web page  - thus the page would load two smaller images. Technically this gave a good result, but cutting the image in half was not enough. We therefore generated a script that sliced the image into 500 by 500 pixels (totaling 64 separate images), and stitched them all back together again once they were loaded into the browser.

The outcome was a high-resolution image (made up of smaller individual images) that renders sharply even when zoomed right in. This gets around the issue of the Safari web browser on an iPad automatically scaling down large images.

Research suggests that this may be a first in application development of this sort, especially one developed wholly in HTML5.

Gesture enhanced interactive

Once this high resolution was served up onto the new iPad3, in high resolution quality, it became clear that it would make more sense to make this a ‘gesture enhanced’ (pinch to zoom) interactive in addition to interpreting predetermined parts of the painting.

This means that the user can now fully explore the entire image, zooming right into any part of the image, whilst being able to read interpretive labels embedded within the image.

Colour Accuracy

The next problem to solve was the one of colour accuracy. Due to the original paintings being very dark, most images that we had to play with were lightened in order to see the detail. This lightening caused the colours to be untrue to the original, something that would be noticeable once screen and canvas were next to each other in the gallery.

A quick phone call to our photography department affirmed that they had high-resolution master TIFF files available that were ‘colour correct’, i.e. the colours in the digital capture were exactly as they were in the painting.

These colour correct images turned out to be strikingly different to the ones that we had previously been playing with, the increased sharpness causing even more detail to become apparent, even figures appeared that weren’t noticeable on the previous images.

The application will be installed alongside the paintings of Margam House in the Art in Wales 1500-1700 gallery at National Museum Cardiff in October 2012.

Bringing it all together: Art in Wales 1550-1700 

A parallel development to this in-gallery interactive is a website interactive exploring a major portrait of the builder of Margam House –

(hung alongside the Margam paintings in Art in Wales 1550-1700 gallery). Again, certain parts of the painting can be explored in high resolution through interpretive labels embedded in the image. This further compliments an existing interactive, exploring another major portrait in the gallery –

It is hoped to extend this program to include all the items in the gallery, thus forming a holistic digital interpretation of Art in Wales from 1550-1700, available both within the gallery and through the website.

Something we get a lot of excitement (and sometimes head scratching!) from here in the Clore Discovery Centre is helping you to identify your finds. Every year museum visitors bring us thousands of objects they have found/excavated/collected and ask us to help identify them. 

This summer Will Hardy came to us to find out more about some fossils he had found recently. Of the three pieces one was particularly exciting as it was beautifully preserved. It might not look much from my dodgy phot but this fossil is amazing!

It's part of a plant called Calamites from the Welsh Coal Measures and is about 300 million years old which grew to about 30m high!

Well found Will!

Over the next few weeks we'll be challenging you to identify some of our 'mystery objects'

Dros y pythefnos diwethaf rydym ni wedi bod yn rhedeg gweithgareddau ar gyfer teuluoedd i'w wneud ag arddangosfa Ffotograffydd Bywyd Gwyllt y Flwyddyn Veolia yma yn Amgueddfa Genedlaethol Caerdydd.

Wnaeth dros 400 ohonoch chi gymryd rhan ac mai hi wedi bod yn bythefnos bendigedig o anturiaethau ffotograffig! Rydw i wedi bod yn brysur yn llwytho siwd gymaint o'r lluniau ag sy'n bosib i dudalen Flickr Clwb Ffoto AGC ac mae rhaid i mi ddweud eu bod nhw'n edrych yn wych! Mae'r lluniau ar y dudalen Flickr wedi eu trefnu i mewn i setiau ar ochr dde'r dudalen felly os wnaethoch chi gymryd rhan y cwbl sydd angen i chi wneud yw clicio ar ddyddiad eich ymweliad i'r Amgueddfa a chwilio am eich enw!

Mi fydd y lluniau yn cael eu harddangos ar y sgrin yng Nghanolfan Ddarganfod Clore yn yr Amgueddfa ar ddydd Sadwrn Medi'r 8fed felly os wnaethoch chi gymryd rhan yn y gweithdai dewch i weld eich lluniau yn cael eu harddangos yn yr Amgueddfa Genedlaethol!

Hoffwn ddiolch i Cat, Lauren a Catherine am wneud job mor dda o redeg y gweithgareddau a hoffwn ddiolch hefyd i bawb wnaeth cymryd rhan. Diolch!