Domes in Plains South of Ius Chasma

rderosa, I have checked your theory on #2 above. While I agree in theory that the IAS viewer should do what you say, it doesn't.

If you save the screen view in the highest allowed resolution through IAS, you will get a resulting image that is lower quality than if you take multiple screen shots of the area at 1:1, and piece them back together on a new image with a high resolution (i.e. 200 dpi) background.

I'll post an example below.

If you take the portion saved from IAS on the example image I have posted and increase the size of that one to the same size as the pic I pieced together from screenshots, you will get nothing but a bunch of ugly pixels.

Try it yourself and you will see.



And here is a link to the feature I am showing in the example, for anyone interested:

[url] marsrocks.googlepages.com/ready4 [/url]

<blockquote id="quote"><font size="2" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Only problem though is that I can't prove it, because if I download the whole 177MB file, and try to open it in my Paint software, I get the same error I got a year ago when I last tried it, and I'm not inclined to spend any time trying to figure out why.
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Some of the earlier MRO images were less than 100MB and at that time I was able to download a few complete images. If I recall the Cydonia face was around 90MB, though I could be wrong. I did compare images at 100% magnification that I had dowloaded previously with IAS viewer images that later became available, and come to think of it they were pretty close in appearance, but I'm just going by memory now.

Here is a better comparison image of the same feature.

On the left it is repieced together version from the 1:1 screenshots, and on the right, you see what you get from the IAS save function when you try and save a large area in IAS.

<blockquote id="quote"><font size="2" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">If you save the screen view in the highest allowed resolution through IAS, you will get a resulting image that is lower quality than if you take multiple screen shots of the area at 1:1, and piece them back together on a new image with a high resolution (i.e. 200 dpi) background. [MR]
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MR, what software do you use to take " multiple screen shots of the area at 1:1"?

Whatever it is, you make a good point about the quality of the IAS saved shots. If you can, can you give us more comparisons from different images, to see if your results hold true? [Neil]

Neil, the IAS viewer will let you take screenshots one at a time by clicking on the icon to the left of the save to disk icon. When you hover over it, the icon gives you the note: "copy current view to the clipboard." Before you copy it, be sure you have set your view to 1:1, by clicking on the 1:1 icon. All of your screenshots must be 1:1 in order to yield the best resolution, and in order to line up correctly.

Each time, after you have copied it at 1:1, you have to paste it into a high resolution background, in your graphics software (i.e. photoshop or photopaint). Just start with a new image, set for example to 10 inches by 10 inches at 200 d.p.i. resolution.

It takes a little skill (and can be time consuming) to carefully line these up with one another, when pasting in subsequent screenshots. But to get multiple screenshots together, you have to take them one at a time, and paste them one at a time into your re-pieced version. In other words, you have to have your normal graphics program and IAS viewer running at the same time to make it work under this process.

So, I share rderosa's sentiments in the rest of his post. Why not allow the viewer to just save portions of the view at the highest possible resolution? It would only make good sense. Maybe they will improve the IAS viewer's save function in future versions.

If anybody has a better solution, please post it, as you will save me a lot of time.

Also, be careful that you are downloading the highest resolution version of the image to view in IAS viewer. The hires versions now exceed 1 Gigabyte in size. The big ones are the only ones that have the .25/meter per pixel resolution. The other ones are lower resolution with far fewer total pixels. So, pay careful attention to be sure you are getting the biggest one.

You want to get the RDRs - which are huge files.