Ambiguity with converting to PNG

[Postscripter]

Hello.

I use PhotoFiltre 6.2.7 and 6.5.2. There is a serious bug with "automatization" tool. Take a look at this two PNG (in attachments) - first converted manualy from original BMP, and second - with use of "Automatization" function. Both of them have similar color space - 16 colors. But first weighs only 60 kb, while second - at least 122 kb !

What's wrong?

[Postscripter]

Test original.bmp


Test 16 colors (manual processing).png


Test 16 colors (automatic processing).png

[Antonio]

I think it is not a bug but perhaps your base image is in 256 colors ?

When you use the automate, it force image in 16M for filters and when you save the file is bigger.

In the automate, you must force the color count to 256 to reduce the file size. Of course if all your base images are in 256 colors max...

[Postscripter]

I tested it with different pictures - the same result. For example look at the properties of presented "Test" images:

Manual:

Code : Tout sélectionner

Proprietes de l'image
Nom de l'image : Test manual.png
Dossier : C:\Documents and Settings\Саша\Рабочий стол\
Dimensions : 500 x 500 pixels ==> 13,23 x 13,23 cm  (96,00 dpi)
Nombre de couleurs : 15
Taille du fichier : 59,63 Ko
Date : 13.11.2011 12:23:46

Auto:

Code : Tout sélectionner

Proprietes de l'image
Nom de l'image : Test auto.png
Dossier : C:\Documents and Settings\Саша\Рабочий стол\
Dimensions : 500 x 500 pixels ==> 13,23 x 13,23 cm  (96,00 dpi)
Nombre de couleurs : 16
Taille du fichier : 122,73 Ko
Date : 13.11.2011 12:23:48

Current job - reducing weights of some scanned images. Original images have 16 colors, but are presented in BMP.

Manual: opening, converting to RGB (as you said), converting to 16 colors, saving to PNG. Result - 147kb. File properties: "4-bit color image"
Auto: converting to 16 colors, saving as PNG. Result - 3,8 MB. File properties: "4-bit color image"

It looks like a bug, smells like a bug... So... It's a bug.

[Postscripter]

Are you here, Antonio? What can you say?

[Antonio]

i will test this week with your image...

[Postscripter]

Thanks!

[Antonio]

I tested, it is not a bug but i use a default compression level = 7 for direct save function and Compression level = 0 in the batch module.

I will set compression level = 9 (best size) for both in the next version

[Postscripter]

Thank you. It will be very, very helpful! But will it affect quality?

[Antonio]

no, png don't affect quality only time for compression

[Postscripter]

[Postscripter]

Hi, Antonio! It seems you forgot about me...?

I will set compression level = 9 (best size) for both in the next version

I tried 6.5.3

[Postscripter]

http://files.mail.ru/O2B03H ---examples---

[Antonio]

fixed for PhotFiltre 7 and for next studio version

[Postscripter]

But what about "users which remain allergic to layers"?