Richsul

Thanks, I'll look into the LUT. What is important would be to port over existing ACV curves. Where to find information on LUT? I am on the prowl. --Dick Sullivan

Somehow it shows "richsul@earthlink.nwr," it is actually "richsul@earthlink.net." I'd like to correct that. How can I do it? Thanks --Dick Sullivan HonFRPS

Folks, There are thousands of photographers making platinum prints, palladium, gum, oil prints, resinotype, cyanotype, etc. Originally these were historic processes and were made via contact negative. Today, we use a digital negative made in a digital printer. Each process, needs a negative, and the negative needs to be corrected for the process's formula, paper, climate conditions (Key West vs Santa Fe,) and printer and inkset, (Matte Black vs Photo Black,) or RGB, vs grayscale.) Making a curve is tedious and we share them, At Bostick & Sullivan, at Photrio, Alternative Photography, and so on. Many are switching over to Affinity, my favorite too... but... we have to keep a subscription to Photoshop to be able to apply to make a negative on Pictorio. This is nice for Adobe, but not to Affinity's users. We need to be able to read a ACV correction curve and apply it to a digital image before printing. This is because most of these processes are printed using the blue and near UV spectrum and various inks transmit UV light in a non linear fashion. For instance a tiny amount of yellow increases contrast. We are in need of Affinity: Being able to read and apply a ACV curve from Adobe, Or convert and existing ACV curve to an Affinity curve. Or at least be able to create a curve in Affinity. This is done by printing a step wedge and scanning the print and coming up with a correcting value and building a new curve from the corrected values. A sample curve created this weekend is attached. Thanks. -- Dick Sullivan HonFRPS Honorary Fellow of the Royal Photographic Society www.bostick-sullivan.com Santa Fe, New Mexico 10%pt_AFOplatinumprintcurve.acv Untitled-1.tif

Yes, please move to Affinity Photo, it was my fumbling around finding where the features forum was located. The right church, wrong pew! Thanks

Folks, There are thousands of photographers making platinum prints, palladium, gum, oil prints, resinotype, cyanotype, etc. Originally these were historic processes and were made via contact negative. Today, we use a digital negative made in a digital printer. Each process, needs a negative, and the negative needs to be corrected for the process's formula, paper, climate conditions (Key West vs Santa Fe,) and printer and inkset, (Matte Black vs Photo Black,) or RGB, vs grayscale.) Making a curve is tedious and we share them, At Bostick & Sullivan, at Photrio, Alternative Photography, and so on. Many are switching over to Affinity, my favorite too... but... we have to keep a subscription to Photoshop to be able to apply to make a negative on Pictorio. This is nice for Adobe, but not to Affinity's users. We need to be able to read a ACV correction curve and apply it to a digital image before printing. This is because most of these processes are printed using the blue and near UV spectrum and various inks transmit UV light in a non linear fashion. For instance a tiny amount of yellow increases contrast. We are in need of Affinity: Being able to read and apply a ACV curve from Adobe, Or convert and existing ACV curve to an Affinity curve. Or at least be able to create a curve in Affinity. This is done by printing a step wedge and scanning the print and coming up with a correcting value and building a new curve from the corrected values. A sample curve created this weekend is attached. Thanks. -- Dick Sullivan HonFRPS Honorary Fellow of the Royal Photographic Society www.bostick-sullivan.com Santa Fe, New Mexico 10%pt_AFOplatinumprintcurve.acv

Thanks Walt. BTW, is there ever going to be a nice book on Publisher? --Dick Sullivan

I download a JPG and load it to a page in Publisher. I then invoke Affinity Photo persona. I then want to resize the image but resize is gray out? Thanks. --Dick Sullivan

Thanks, I am out searching now. --Dick

I am Dick Sullivan of Bostick & Sullivan. We like to consider ourselves the center of the alt-photo universe. I am in love with the Affinity threesome. Some of you may know us as the "platinum people" known for the platinum print, one made of platinum metal. We have been in business since 1980. But rather than get involved in other processes, I would like to focus on platinum. Note that this is a print making process. Note that you need a negative the same sizes as the print. That where affinity comes in. In the beginning we would make an positive from the negative and make an enlarged negative from the positive. UGH! Then came the digital revolution, then came Photoshop. Hooray! Then came Affinity, hooray, hooray!!! But... I'd love to convert our customer base of many many thousands over to Affinity. But... It's the negative. All the factors going into a print can affect the image. The inkset of the printer for one. Old Epson's vs New Epson's. The paper that the print goes on. Which chemicals are used such as ferric oxalate or ammonium ferric oxalate or ammonium tetrachloriplatinite vs Potassium chloriplatinite, and as some will swear , whether Jupiter is in the House of Mars. Generating a curve is nasty business. People share them. Some are generic and give a generic result, others are very detailed and specific. All are saved and shared as Photoshop .ACV curves. I posted this problem more briefly back when, I did not explain and I am sure folks at Affinity had no idea what I am talking about, it really harks back to real photography 100+ year-old. The question: Are we going to out in the cold or is there a chance there will be a way to convert an ACV curve to something that Affinity Photo can use. I see the LUT that looks like an intermediary. I believe Gimp reads ACVs so maybe they could do something. But Affinity threesome is so much better. No saving this and that and open here an there and processing your negative in Gimp and printing in Affinity Photo. It seems simple. Read the ACV file and apple the coordinates. Since we are only working in B+W , all ther RGB channels would do, and convert to a LUT. I was at one time an IBM Systems Programmer, so if I am on the right track let me know. --Dick Sullivan HonFRPS www.bostick-sullivan.com https://www.photo-historica.com/digitalnegatives Our other Site!

Dan, That does help - I think! I am new to the Affinity tools so I need to dig in and see what is here. I am hoping I can build some thing that will take a PhotoShop curve and load it into Af Photo. There is a huge resource of negatives out there that have been produced for over 20 years and represent thousads of hours of work. Mostly all for Epson printers. Each change in a formula, exposure unit, etc etc or an inkset will cause a curve change. There are perfectionists who need a curve for even a minor change but many can use a "generic" curve that "sort" of fits their situation. Here's the basic process: Using a step wedge make a series of prints to determine the time of exposure for a maximum black Copy the print, with scanner or camera and then mathematically even out the steps in the wedge so each of the 10 steps creates a 10% change in the density of the print. This curve is then applied to the digital image, inverted to a negative, and printed. The curve is stored and passed around as a photoshop .acv curve. So a step from a wedge can be read as a number such as one would get from a densitometer and entered in the 0 steps to build a curve? This might be a problem because one is not reading an image eye and "correcting" it's far too subtle for that . It would like looking at a step and saying that a step is 10.2% too light and correcting that point in the curve by lightening it by 10.2%. When a curve is applied the image looks really weird. I will spend some time this week end working on this. I am sure we can figure out something here. --Dick Sullivan HonFRPS

First, I want to introduce myself. I am Dick Sullivan of Bostick & Sullivan, we, since 1980, have been a major supplier of materials for antique photographic processes, I'd like to think we were seminal in introducing the platinum photograph to modern workers. I am also a Fellow and an Honorary Fellow of the Royal Photographic Society of Great Britain. Thus my point, or points if you will: I am thrilled with the Affinity Suite. My firm, Bostick & Sullivan, has a mailing list of over 25,000 customers. Most are dedicated workers in historic photographic processes, the platinum print being a major market. I needn't belabor the point that the Suite is powerful and economical and I would love to support and promote it through our mailing list/ Many of the early processes are contact photo processes, and up to this point, PhotoShop has been a major tool in making contact negatives from digital negatives. We provide some generic platinum curves on our website for downloading. These curves are necessary for contact printing in silver, palladium, platinum, albumen and many other early processes. Each variation of a process, either through its chemical formula or the effect desired usually requires a new curve. Making a curve is a time consuming process so there is a lot of sharing going on. My research has shown that there is no way for us to share Affinity Photo curves, so PhotoShop, and its curves, will remain the standard. I realize that a few thousand dedicated photographers is a small number for a major software company to support, but I am hoping a curves transport mechanism and/ or ability to open and use the curves we use now (PS) will soon be available. I have read on the forum here that one can apply the curve to a jpg and transport it that was but it was a brief description, and I could not make it work. Perhaps more details will help. I am willing to do what I can to help on this end. Thanks. --Dick SullivanHonFRPS