The Official non-auto Image thread

Rudra Sen · 17th December 2008, 11:25

I've seen that Guru. It's because of compression. It happens on other forums too..including photography forum. Only way to eliminate this is to keep the file size small. This one must be around 50cm in height.

Torqueguru · 17th December 2008, 11:26

@Rudra
Awesome is the word, what kind of post processing did u do? Just desaturated and adjusted curves?

Been a while since i did some HDRs, so here comes one

The Official non-auto Image thread-3112822459_ec59327f1f_b.jpg

suren181 · 17th December 2008, 11:30

Quote:

Originally Posted by Torqueguru

@Rudra
Awesome is the word, what kind of post processing did u do? Just desaturated and adjusted curves?

Been a while since i did some HDRs, so here comes one
Attachment 80237

Amazing, it looks so 3 dimensional. beautiful snap Guru. Keep going on it.

Rudra Sen · 17th December 2008, 11:32

Lovely shot Torqueguru! Where is this?

I don't go for desaturation at all. Exposure and curve are the main. But this was shot deliberately underexposed with spot metering.

Rehaan · 17th December 2008, 12:27

Quote:

Originally Posted by gkrishn

Yes i do that, it still exhibits. I am not talking about resizing... i guess it is some thing to do with file size compression that is being done.

In the above rudra's pic, look closely near the edges of the tree. From the base of the tree to the top cone... on the edge you will see some kind of dithering.

EDIT: Just noticed, in the same pic, there is even heavy banding on the area with sky. I am using a half decent NEC monitor. I don't think this is my monitor issue.

Gkrishn,

What TSK is saying is that when an image is uploaded to Team-BHP there is no re-compression happening to the original image (which is viewed by clicking the thumbnail).
Only the "thumbnail" (an image with the black bar at the bottom) gets re-compressed.

The artifacts you see might be due to the compression that Rudra has applied to make the file 120~kb before uploading to TBHP.

cya
R

NetfreakBombay · 17th December 2008, 12:37

Quote:

Originally Posted by Rehaan

when an image is uploaded to Team-BHP there is no re-compression happening to the original image (which is viewed by clicking the thumbnail).

IMHO, images do get re-compressed.

It would be due to addition of Team Bhp logo on lower left corner. Some code somewhere would be uncompressing it to add the logo and compress it again.

Torqueguru · 17th December 2008, 12:39

@sren181
@Rudra
Thanks guys,
well the place is called Halfmoon Bay, an hour's drive from San Jose.

tsk1979 · 17th December 2008, 13:34

Yup, applying watermark will lead to slight quality loss, but not noticeable, however resizing may introduce artifacts

gkrishn · 17th December 2008, 14:00

Quote:

Originally Posted by Rehaan

Gkrishn,

What TSK is saying is that when an image is uploaded to Team-BHP there is no re-compression happening to the original image (which is viewed by clicking the thumbnail).
Only the "thumbnail" (an image with the black bar at the bottom) gets re-compressed.

I clearly understood what tsk is saying. But i dont think that is the case. I am not talking about the thumbnail images. I open images at 100% and then i see the artifacts there.

Quote:

The artifacts you see might be due to the compression that Rudra has applied to make the file 120~kb before uploading to TBHP.

I disagree. My own images gets these artifacts added after i upload here. Same image in flickr for example dont have this issue. Also i dont think rudra is doing a low compression after spending hours on those images. Look at the banding in his image. I dont think he did that.

An example...
http://www.team-bhp.com/forum/attach...d-img_4807.jpg

And this from flickrs
Flickr Photo Download: Near valley school, bangalore...

Both at original uploaded resolution. Look at the edge of petal, on the bottom petels... there is some compression artifacts in the tbhp image.

Quote:

Originally Posted by NetfreakBombay

IMHO, images do get re-compressed.

It would be due to addition of Team Bhp logo on lower left corner. Some code somewhere would be uncompressing it to add the logo and compress it again.

Probably you got it right. The code that adds that logo might be the culprit.

Rehaan · 17th December 2008, 14:36

Ok i see your point Gkrishn.

The uploaded file is actually unchanged (on our server) -- however, when it is served, a watermark is dynamically overlayed and that is the image you end up with in your browser. As you guys have mentioned, it is most likely this process that is degrading the quality of the "original" uploaded pic.

cya
R

NetfreakBombay · 17th December 2008, 14:45

Amazing photographs from Nat Geo 2008.

International Photography Contest 2008 - Winners - National Geographic Magazine

PS : Don't know if this is the right place for this post.

tsk1979 · 17th December 2008, 14:50

This was taken at Kosi

The Official non-auto Image thread-437916401_eixo8l.jpg

Rudra Sen · 17th December 2008, 14:58

Lovely Tanvir. Nice feel it has.

rjstyles69 · 17th December 2008, 15:13

Tanvir nice shot there man, did you use the remote shutter release for this ?

tsk1979 · 17th December 2008, 15:35

Quote:

Originally Posted by Rudra Sen

Lovely Tanvir. Nice feel it has.

Thanks Rudra

Quote:

Originally Posted by rjstyles69

Tanvir nice shot there man, did you use the remote shutter release for this ?

Nope, I use RSR for exposures exceeding 30 seconds

17th December 2008, 14:50	#4422
tsk1979 Team-BHP Support Join Date: Feb 2005 Location: San Jose, CA Posts: 23,717 Thanked: 22,825 Times View My Garage	One from my side This was taken at Kosi

17th December 2008, 11:25	#4411
Rudra Sen Team-BHP Support Join Date: Apr 2004 Location: Bangalore Posts: 11,590 Thanked: 6,532 Times View My Garage	I've seen that Guru. It's because of compression. It happens on other forums too..including photography forum. Only way to eliminate this is to keep the file size small. This one must be around 50cm in height.

17th December 2008, 11:26	#4412
Torqueguru BHPian Join Date: Nov 2007 Location: Seattle Posts: 277 Thanked: 165 Times View My Garage	@Rudra Awesome is the word, what kind of post processing did u do? Just desaturated and adjusted curves? Been a while since i did some HDRs, so here comes one

17th December 2008, 11:32	#4414
Rudra Sen Team-BHP Support Join Date: Apr 2004 Location: Bangalore Posts: 11,590 Thanked: 6,532 Times View My Garage	Lovely shot Torqueguru! Where is this? I don't go for desaturation at all. Exposure and curve are the main. But this was shot deliberately underexposed with spot metering.

17th December 2008, 12:39	#4417
Torqueguru BHPian Join Date: Nov 2007 Location: Seattle Posts: 277 Thanked: 165 Times View My Garage	@sren181 @Rudra Thanks guys, well the place is called Halfmoon Bay, an hour's drive from San Jose.

17th December 2008, 13:34	#4418
tsk1979 Team-BHP Support Join Date: Feb 2005 Location: San Jose, CA Posts: 23,717 Thanked: 22,825 Times View My Garage	Yup, applying watermark will lead to slight quality loss, but not noticeable, however resizing may introduce artifacts

17th December 2008, 14:36	#4420
Rehaan Team-BHP Support Join Date: Feb 2004 Location: Bombay Posts: 24,046 Thanked: 34,078 Times	Ok i see your point Gkrishn. The uploaded file is actually unchanged (on our server) -- however, when it is served, a watermark is dynamically overlayed and that is the image you end up with in your browser. As you guys have mentioned, it is most likely this process that is degrading the quality of the "original" uploaded pic. cya R

17th December 2008, 14:45	#4421
NetfreakBombay Senior - BHPian Join Date: Jan 2008 Location: Bombay Posts: 1,466 Thanked: 1,021 Times	Amazing photographs from Nat Geo 2008. International Photography Contest 2008 - Winners - National Geographic Magazine PS : Don't know if this is the right place for this post.

17th December 2008, 14:58	#4423
Rudra Sen Team-BHP Support Join Date: Apr 2004 Location: Bangalore Posts: 11,590 Thanked: 6,532 Times View My Garage	Lovely Tanvir. Nice feel it has.

17th December 2008, 15:13	#4424
rjstyles69 Senior - BHPian Join Date: Sep 2006 Location: Bengalooru.. Posts: 4,343 Thanked: 842 Times View My Garage	Tanvir nice shot there man, did you use the remote shutter release for this ?