Minolta 5400 Color Negative - Scan as Positive

Auto exposure as negative with adjustments to overall gray balance done in photoshop
scan_as_negative_auto_exposure
Auto exposure - scanned as negative
scan_as_negative_auto_exposure_step2
Auto-exposure negative, gray scale corrected in photoshop,
 note white squares are clipped
Scan as positive, adjust histogram in scanner program to remove orange mask, balance done in photoshop
scan_as_positive_16bit_nomask2
scan as positive, manual exposure,
 mask removed, contrast reduced
scan_as_positive_16bit_nomask2_step2
photoshop: remove color cast set b&w point,
 then fix gray scale
Scan as positive, make all changes to image in photoshop
scan_as_positive_16bit_raw
Negative scanned as positive, manual exposure,
 16bit output
scan_as_positive_photoshop1
reverse curve applied in photoshop
scan_as_positive_photoshop2
Adjust black and white points with curves
scan_as_positive_photoshop3
Overall gray scale balance with curves
scan_as_positive_photoshop4
Final gray scale curves adjustment
scan_as_positive_photoshop5
Final step - make image look more "realistic"

You can see an enlarged view of any of the images by clicking on the thumbnails, above.
You can also navigate from one to another using the pointers in the upper right corner of those pages.

Click here to see the final side-by-side comparisons of the manually and automatically adjusted images.

Note that all these images were imported and edited in 16 bit mode,
they are reduced to 8bit for screen display. Opinion is divided on whether this is necessary.

Unresolved problems:
1. The blue channel is clipped at 255 in the original scan in the blue square at lower left and in the magenta bar in the upper sample.
This is without any exposure adjustments or alterations in the scanner software. There does not appear to be any way to change this.

2. The processing in the scanner program seems to be done using 8 bit calculations, regardless of the output mode setting,
so minimizing the amount of changes done this way might be better.

Conclusions:
Although not apparent from this image (the white squares have no texture in the original),
doing adjustments after scanning may be beneficial for images with important detail in the highlights.

back to tips

Send email to robert.feinman@gmail.com

© 2003 Robert D Feinman