Compressing High Resolution Pictures-Help-

[Guest]

Let's say I have the full size photo of Andromeda Galaxy (that is 4.3Gb btw) and I don't have 600+ FHD displays. 

 

Is there way that I can compress this image to a smaller version so I can display it on a 8K monitor or something like that? 

 

And if I compress it , will the picture have a  higher pixel density so I can zoom without losing good quality? (Asking this for other photos as well) 

[mariushm]

4 GB what ?  4GB in memory as uncompressed bitmap (3 bytes per pixel), 4 GB as JPG or PNG or PSD ?

 

If you have a lot of memory, a 64bit image viewer (for example 64 bit freeware Irfanview) should be able to load the image and resample to 8K but it would take quite a bit of time.

 

Alternatively, you could separate the image in 10% by 10% chunks and resample each of those to 8K / 10 and then stitch them together

 

If you can upload that image somewhere, i'm willing to make an 8K or whatever version for you

 

PM me and i can give you a ftp account where you can upload a large file, if you can't use megaupload or other file hosts (that don't process the image file in any way)

 

nevermind; found the PSB file on NASA's site, downloading to play with it.

 

[porina]

I presume it is this image: http://www.spacetelescope.org/images/heic1502a/

 

Downloading a smaller version would probably be a lot easier to work with than the full resolution file.

 

If you want to be able to zoom with good quality, you'd need to keep a higher resolution than the display. For a static display, like wallpaper, I'd do a one off resize for it.

[Guest]

1 hour ago, mariushm said:

4 GB what ?  4GB in memory as uncompressed bitmap (3 bytes per pixel), 4 GB as JPG or PNG or PSD ?

 

If you have a lot of memory, a 64bit image viewer (for example 64 bit freeware Irfanview) should be able to load the image and resample to 8K but it would take quite a bit of time.

 

Alternatively, you could separate the image in 10% by 10% chunks and resample each of those to 8K / 10 and then stitch them together

 

If you can upload that image somewhere, i'm willing to make an 8K or whatever version for you

 

PM me and i can give you a ftp account where you can upload a large file, if you can't use megaupload or other file hosts (that don't process the image file in any way)

 

nevermind; found the PSB file on NASA's site, downloading to play with it.

 

https://www.spacetelescope.org/images/heic1502a/ 

 

it's here , sorry I don't know if it's jpg, png or something else but I think 4.3Gb version is uncompressed like you said.

[mariushm]

It's PSB (photoshop big file) ... 69536x22230 8-bit (per color) sRGB

Uncompressed would be ~ 4637355840 bytes or 4422 MB

Imagemagick for some reason crashes when trying to save to uncompressed bitmap or raw, maybe it would work if i tell it to save only a slice of it (and make let's say 10 vertical slices) but i'm too lazy to search the command line syntax.

Don't have other software that support PSB and don't feel like installing Adobe Photoshop CS3

[Glenwing]

3 hours ago, MaestroOCZ said:

Let's say I have the full size photo of Andromeda Galaxy (that is 4.3Gb btw) and I don't have 600+ FHD displays. 

 

Is there way that I can compress this image to a smaller version so I can display it on a 8K monitor or something like that? 

 

And if I compress it , will the picture have a  higher pixel density so I can zoom without losing good quality? (Asking this for other photos as well) 

If you're talking about scaling for display, yes any image viewing program can do this, just press fullscreen and it will scale the image down to fit on your monitor. Or do you just mean file size compression?

[Guest]

5 hours ago, Glenwing said:

If you're talking about scaling for display, yes any image viewing program can do this, just press fullscreen and it will scale the image down to fit on your monitor. Or do you just mean file size compression?

 I meant as a resolution compression , thanks for the info

[Glenwing]

14 minutes ago, MaestroOCZ said:

 I meant as a resolution compression , thanks for the info

Just look up how to resize images with whatever image editor you're using.