SIGMA's Garish Red Problem ...

[LUIS A GUEVARA]

Hi, guys!

I currently run 1.08. So I don't think that is the problem.

Sincere regards, Jim R

Apparently the problem was solved after V1.07 . However Firmware does get corrupt , like all software , and a reinstall of firmware might be in order .

There is nothing to fear if you have an external power source for your camera , or Freshly charged batteries.

This is probably the best link to Sigma Downloads and instructions:

http://www.sigma-sd14.com/software/firmware/

[Ver. 1.08]
Corrects the occasional phenomenon of an image recorded in RAW format appearing to have an unnaturally large file size.
Corrects the rarely occurring error of camera freeze and image recording failure when shooting continuously or if the shutter button is pressed when the CF Card Busy Light is blinking.
When Bulb Mode is used Sigma Photo Pro now displays the actual shutter speed used in the exposure rather than just showing the word "Bulb".

Luis

 

[LUIS A GUEVARA]

Merry christmas

Merry Christmas Everybody !!

​

View attachment 908

with no red color color problems. Luis

​

 

[Guest .]

Same to you Luis!! :z04_9856:

A very nice picture!

See you

Klaus

 

[Steaphany]

I just found a way to selectively modify individual ranges of color with PhotoShop. I downloaded Klaus' original Rose image to play with using a technique where an Hue/Saturation Adjustment Layer is applied to a color selection mask.

Here I have opened the Rose in PhotoShop and chosen the Select->Color Range tool:

View attachment 1312

Using the additive color picker, I click on the Red's and Magenta's in the Rose, I also adjust the Fuzziness to select the Rose hues with out picking up anything from the background. The Selection Preview shows that only the Rose hues have been selected:

View attachment 1313

I modify the selection by Feathering by 5 Pixels:

View attachment 1314

I then create a Hue Saturation Adjustment Layer and this takes the color selection as the mask where the adjustments are applied, only to the Red's and Magenta's of the Rose:

View attachment 1315

I reduced the Saturation by 30 and, for my own personal aesthetics, I increased the Hue by 15 for a redder Rose. In this image, you can easily see the histogram has been contracted :

View attachment 1316

Please note that these adjustments were by eye on my LCD monitor. I have not done any tests to see how well they would perform when printed or displayed on other devices.

The final image:

View attachment 1317

 

[Steaphany]

I then created a Contrast Brightness adjustment layer to enhance the dynamic range:

View attachment 1318

Made an additional adjustment to the Saturation to balance it with the contrast adjustment:

View attachment 1319

For this final image:

View attachment 1320

 

[Guest .]

Hi Steaphany,

well, it looks good! Thanks for your busy and highly intresting contribution. :z02_respekt::z02_respekt:.

I am surprised in a way, what you achieved with my basic image, since (downloaded!) it does not contain a colour depth more than 8 BITs RGB.

There is just one thing, which I find problematic going your workflow and that is WORK!

To me it appears most difficult and time consuming to select the rose in PS?!

See you with first class contributions like this ....

Klaus

 

[Steaphany]

Klaus,

That is the best part of this process, it's not labor intensive. I selected the whole Rose with only a handful of clicks. I'll demonstrate.

When you first open the Color Range Select tool, click on the Plus Eye Dropper color picker. This is the one which makes additions to the select set with each mouse click. In these screen captures, I have the Selection Preview set to Black Matte to better show my progress. Then start clicking in the Rose of the Original Photoshop image window. Here is what was selected after Mouse Click 1:

View attachment 1321

Then mouse click 2 added more to the selection, now we have nearly the whole Rose:

View attachment 1322

Mouse clicks 3 and 4 each contribute more:

View attachment 1323

View attachment 1324

Since the petals on the far side of the Rose still have black regions showing that there are areas still not selected, I clicked in one of these last remaining regions:

View attachment 1325

There it is, apart from a few shadow regions, the whole Rose has been selected based on color with only 5 Mouse Clicks. To finish this off, I raised the Fuzziness from 30 to 134 and you'll have this:

View attachment 1326

A Fuzziness of 30 was insufficient, 134 rounds off the sampled color selection points to select the whole Rose. Going beyond 134 ends up in parts of the background being added to the selection.

That's all there is to the magic, Open the Color Range select tool, set it up, click the mouse 5 times, and adjust a single slider. Click OK and you can go on to perform what ever manipulations you want.

 

[Guest .]

Hi Stephany,

thanks again for your well done screen-shots!

All this might become more difficult, as soon as a scene is more challenging/difficult .... with a similar coloured background?!

However .... it works!

See you with nice pictures

Klaus