2011.07.27 16:39 "[Tiff] Using photon lists rather than rasters", by Terry L. Sprout

2011.07.28 00:56 "Re: [Tiff] Using photon lists rather than rasters", by Terry L. Sprout

I appreciate your comments. After more thought, I think I will take your suggestion and at least convert the image to a 1-bit/sample image (I will have to experiment on the time it takes to compress further). Another scheme we will use to save disk space is to integrate multiple images into a single image. This will create a longer exposure (seconds or minutes per image) and the bandwidth will be decreased significantly. Then I can include the integrated image along with a list of all the photons used to create the image. Scientists can still take the photon lists and create more images at different exposure times as they wish. This scheme will allow any TIFF reader to display the image and it allows others that understand the photon lists to do more as desired.

Terry L. Sprout

(510) 324-5501

w7-32

From: tiff-bounces@lists.maptools.org [mailto:tiff-bounces@lists.maptools.org] On Behalf Of Chris Cox

It's still not an image.

You really should use another format more appropriate to your data.

Chris

On 7/27/11 5:31 PM, "Terry L. Sprout" <Terry.Sprout@Agile-Automation.com> wrote:

The 1 bit/sample idea would work if the coordinates were not sub-pixel resolution and if there was only one time-point of photons in the list. Another issue I have is the time it will take to perform the compression. Some cameras I deal with today acquire 1000 ips and we are moving into > 20,000 ips. difficult enough writing the original image; compression will be worse. It's

I understand your concerns regarding undocumented custom compression types. After all, what is the point of using a standard file format if most readers cannot display the image.

What if I publish the compression scheme?

Terry L. Sprout

(510) 324-5501

w7-32

From: tiff-bounces@lists.maptools.org [mailto:tiff-bounces@lists.maptools.org] On Behalf Of Chris Cox

Sent: Wednesday, July 27, 2011 5:01 PM
To: TIFF

Subject: Re: [Tiff] Using photon lists rather than rasters

Tagged Image File Format.

I would rather not see a TIFF "image" that is not an image and is not

readable by other software.

TIFF already gets too much abuse with undocumented custom compression types that render the files useless.

In this case you are creating a vector display list, for which there are more appropriate types.

Personally, just apply a better predictor to improve compression and keep the image data. If all you need are locations/centroids of photon hits you could easily convert the image to a 1 bit/sample representation and compress that. I'd -

Chris

On 7/27/11 3:51 PM, "Terry L. Sprout" <Terry.Sprout@Agile-Automation.com> wrote:

not have a need to support "photon lists", but they will happily render
the raster image part of a processed TIFF file.

My suggestion is to store the coordinates as a metadata tag, which
accompanies with the original (unprocessed) image file. TIFF metadata
tags can store arbitrary byte data and do not have size limits (unless
going into the gigabytes range). This is the recommended way of storing
your coordinates data. And yes, floating point (32-bit, 64-bit and all
IEEE-approved ones) are supported in metadata.