Do you compress your jpeg?

[david_jeuniaux]

Hi everybody. 
In the past, i've always imported least compressed jpeg images to recap 360, thinking, the least compression, the better the quality of the scan.
Now i have to work for a big amount of files and did test with jpeg compression. 
To my surprise, whatever the amount of compression ( from level 12 to 4 in PS jpeg export) recap 360 still make highly defined 3d models, with almost the same amount of polygons.

So here is my question: Do you compress your jpegs before importing? Did you see any decrease in 3d model quality? 

Thanks.

David

[anil_mistry]

Hi @david_jeuniaux,

Thank you for participating in our Community!!! This is good question. Let me run by our development team and will give you an update soon.

Thank you and have a great day!

[david_jeuniaux]

Thank you, i will wait here then . 🙂

[murali.p · Accepted solution]

Hi David,

No the engine does not compress the images.

Regards,

Murali

[david_jeuniaux]

Thanks for the reply @murali.p, but that wasn't my question.

My question is: if i compress my jpegs prior importing, will the quality of the scan decrease?

I did some tests, and it doesn't look like it make any difference if my images are 2MB or 200KB each, but i don't want to make mistake, so i prefer to ask.

Thank you,

[anil_mistry · Accepted solution]

Hi @david_jeuniaux,

I just want to let you know that Images with more pixels or images with higher resolution produce superior results, however take longer to process. So, its depends on your need and what you are trying to achieve as final product.

Thank you and have a great day!

If one or more of these posts helped answer your question, please click Accept as Solution on the posts that helped you so others in the community can find them easily.

[anil_mistry]

Hi @david_jeuniaux,

I'm just checking in again to see if you need more help with this. Did the suggestion @murali.p and I provided yesterday work for you?

If so, please click Accept as Solution on the posts that helped you so others in the community can find them easily.

[david_jeuniaux]

Yes of course, the answer was good. Thank you .

Although i would like to share the datas from my tests.

I used a set of 30 images, shot RAW with a 24MPx DSLR.
I tried those Jpeg compression level in PS:
Level 12:  ~15MB /image
Level 8 :  ~2MB /image
Level 6: ~1MB /image
Level 4: ~500KB /image

i slightly corrected the exposition for all the pics before export. Having the histogram slightly in the right (over exposed) tend to produce better models. 
I ran all those sets in Recap 360 and checked the polycount for each one,but also the amount of fine details.

The result was almost the same amount of polygons for all the scans. In my case 2.1M +-150k. The amount of fine details was also quite comparable. Only some small holes, the nostrils in my model, where filed for the most compressed test.

Based in these results, i now compress lightly my jpegs. I figured that if i use Photoshop level 8, the scans are just as good as with uncompressed images, and it is 7x faster to upload.
I think as long as you have good lighting ( i.e. you shoot at low ISO), you can go all the way down to Level 4 compression.

Hope that can help other peoples.